opinion: Mr. Justice Blackmun
  delivered the opinion of the Court.
  The present phase of this prolonged litigation concerns the propriety of a federal court’s enjoining a municipality from permitting the use of public park recreational facilities by private segregated school groups and by other non-school groups that allegedly discriminate in their membership on the basis of race. We granted certiorari to consider this important issue. 414 U. S. 907 (1973).
  I
  Petitioners are Negro citizens of Montgomery, Alabama. In December 1958, now over 15 years ago, they instituted this class action to desegregate Montgomery’s public parks. The defendants are the city, its Board of Commissioners and the members thereof, the Parks and Recreation Board and its members, and the Superintendent of the Parks and Recreational Program.
  By their original complaint, the petitioners specifically challenged, on Fourteenth Amendment due process and equal protection grounds, a Montgomery ordinance (No. 21-57, adopted June 4, 1957) which made it a misdemeanor, subject to fine and imprisonment, “for white and colored persons to enter upon, visit, use or in any way occupy public parks or other public houses or public places, swimming pools, wadding [sic] pools, beaches, lakes or ponds except those assigned to their respective races.” Both declaratory and injunctive relief were requested. On September 9, 1959, the District Court entered its judgment that the ordinance was unconstitutional and enjoined the defendants from enforcing the ordinance “or any custom, practice, policy or usage which may require plaintiffs, or any other Negroes similarly situated, to submit to enforced segregation solely because of race or color in their use of any public parks owned and operated by the City of Montgomery, Alabama.” The judgment was accompanied by a memorandum opinion. 176 F. Supp. 776 (MD Ala. 1959). On appeal, the Fifth Circuit affirmed but ordered the judgment modified to provide that the District Court retain jurisdiction. 277 F. 2d 364, 368 (1960). The trial court, accordingly, ruled that it “will and does hereby retain jurisdiction of this cause until further order.”
  In 1970, the petitioners sought to reopen the litigation. They filed a motion asking, among other relief, that the respondents be cited for contempt “for deliberately avoiding and violating this Court’s Judgment and Order in this case.” The motion contained allegations that some of the municipal parks had been reopened “in such a manner to avoid the total and full integration of said parks”; that the city had conspired with the Montgomery YMCA to segregate swimming and other recreational facilities and programs; that recreational facilities were unequally allocated as between white and Negro neighborhoods; and that the city discriminated in its employment of personnel in recreational programs. The basis for these claims arose from other, separate litigation initiated in 1969 and resulting in the granting of affirmative relief to the plaintiffs in that suit. See Smith v. Young Men’s Christian Assn., 316 F. Supp. 899 (MD Ala. 1970), aff’d as modified, 462 F. 2d 634 (CA5 1972). In that action the District Court found that the “coordinated effort” of the city and of the YMCA, 316 F. Supp., at 908, and an agreement between them, reached shortly before the closing of the city parks and the entry of the court’s 1959 decree, had effectuated “the perpetuation of segregated recreational facilities and programs in the City of Montgomery,” id., at 909, and that it was “unmistakably clear that its purpose was to circumvent the Supreme Court’s and this Court’s desegregation rulings in the area of public recreation.” Id., at 908. As summarized by the Court of Appeals, the District Court concluded:
  “[T]he YMCA, as a result of the cooperative agreement, has been performing a statutorily declared 'public function’; the Montgomery Park and Recreation Board has, in effect, transferred some of its statutory authority and responsibility to the YMCA, thereby investing the YMCA with a municipal character; and therefore the YMCA has been serving as a municipal rather than a private agency in assisting the Park Board in providing recreational programs for the city.
  “[T]he YMCA’s discriminatory conduct denied the plaintiffs their Fourteenth Amendment rights to Equal Protection of the law; under the facts of this case the plaintiffs’ showing of 'state action’ satisfies the requirement under Title 42; U. S. C. Section 1983 that the YMCA’s conduct be 'under color of law.’ ” 462 F. 2d, at 641-642.
  The modification by the Court of Appeals related only to the disapproval of a provision in the District Court’s order directing a specific Negro-white ratio in the YMCA’s board and executive committee. No review was sought here.
  The claims raised by the petitioners in their 1970 motion were settled by agreement dated January 29, 1971. On July 29, the respondents filed their first written progress report. On September 8, the petitioners filed a "Motion for Supplemental Relief.” App. 15. This motion forms the basis for the present phase of the litigation. The petitioners complained that the city was permitting racially segregated schools and other segregated private groups and clubs to use city parks and recreational facilities. They requested injunctive relief against “the use of City owned and operated recreational facilities by any private school group, club, or organization which is racially segregated or which has a racially discriminatory admissions policy.”
  The District Court granted the petitioners the relief they requested. 337 F. Supp. 22 (MD Ala. 1972). The court reasoned that Montgomery officials were under an affirmative duty to bring about and to maintain a desegregated public school system. Providing recreational facilities to de jacto or de jure segregated private schools was inconsistent with that duty because such aid enhanced the attractiveness of those schools, generated capital savings that could be used to improve their private educational offerings, and provided means to raise other revenue to support the institutions, all to. the detriment of establishing the constitutionally mandated unitary public school system. The court, consequently, enjoined the city and its officials “from permitting or in any way sanctioning the use of city owned or operated recreational facilities by any private school, or private school affiliated group, if such school or group is racially segregated or if it has a racially discriminatory admissions policy.” Id., at 26. The court went on, however, with sparse findings and brief discussion, and similarly enjoined the city and its officials from permitting or sanctioning the use of city recreational facilities “by any private group, club or organization which is not affiliated with a private school and which has a racially discriminatory admissions policy.” Ibid
  On appeal, the Court of Appeals reversed in part and remanded the case with directions. 473 F. 2d 832 (CA5 1973). It sustained that part of the injunction which restrained the use of city facilities by segregated private schools when that use was "exclusive” and not in common with other citizens. Id., at 837. The court ruled, however, that “nonexclusive enjoyment” of those facilities by private school children “was not proven to present a sufficient threat to desegregated public education to support an injunction restraining the clear personal right of the affected children to enjoy such usage in common with the rest of the public.” Ibid. With respect to that portion of the District Court’s order concerning other private nonschool groups, the Court of Appeals held that there was no “symbiotic relationship” of the kind present and condemned in Burton v. Wilmington Parking Authority, 365 U. S. 715 (1961). Consequently, it held that under Moose Lodge No. 107 v. Irvis, 407 U. S. 163 (1972), that portion of the District Court’s order dealing with nonschool groups had to be reversed because the injunction impermissibly intruded upon the freedom of association of citizens who were members of private groups. The court, accordingly, ordered deletion of certain paragraphs of the injunctive order and the clarification of others. 473 F. 2d, at 839-840. The District Court complied with that mandate and, in particular, added the following paragraph to its injunctive order:
  “The injunction issued by this Court does not prohibit the City of Montgomery from permitting non-exclusive access to public recreational facilities and general government services by private schools or school affiliated groups.”
  The plaintiffs petitioned for certiorari; the defendants did not cross-petition.
  II
  The Equal 'Protection Clause of the Fourteenth Amendment does not prohibit the “[individual invasion of individual rights.” Civil Bights Cases, 109 U. S. 3, 11 (1883). It does proscribe, however, state action “of every kind” that operates to deny any citizen the equal protection of the laws. Ibid. This proscription on state action applies de jacto as well as de jure because “[c] on-duct that is formally 'private’ may become so entwined with governmental policies or so impregnated with a governmental character as to become subject to the constitutional limitations placed upon state action.” Evans v. Newton, 382 U. S. 296, 299 (1966). In the present case we must determine whether the city of Montgomery engaged in discriminatory activity violative of the parks desegregation order. We must also decide whether the city’s involvement in the alleged discriminatory activity of segregated private schools and other private groups, through its providing recreational facilities, constitutes “state action” subject to constitutional limitation.
  A
  The Court of Appeals affirmed the District Court insofar as the latter enjoined the “exclusive possession of public recreational facilities such as football stadiums, baseball diamonds, basketball courts, and tennis courts for official athletic contests and similar functions sponsored by racially segregated private schools.” 473 F. 2d, at 836-837. The boundaries of this “exclusive” use approach, however, are not self-evident. We find the concept helpful not so much as a controlling legal principle but as a description of a type of use and, in the context of this case, suggestive of a means of allocating public recreational facilities. The term “exclusive use” implies that an entire facility is exclusively, and completely, in the possession, control, and use of a private group. It also implies, without mandating, a decision-making role for the city in allocating such facilities among private and, for that matter, public groups.
  Upon this understanding of the term, we agree with petitioners that the city’s policy of allocating facilities to segregated private schools, in the context of the 1959 parks desegregation order and subsequent history, created, in effect, “enclaves of segregation” and deprived petitioners of equal access to parks and recreational facilities. The city was under an affirmative constitutional duty to eliminate every “custom, practice, policy or usage” reflecting an “impermissible obeisance to the now thoroughly discredited doctrine of 'separate but equal.’ ” Watson v. Memphis, 373 U. S. 526, 538 (1963). This obviously meant that discriminatory practices in Montgomery parks and recreational facilities were to be eliminated “root and branch,” to use the phrase employed in Green v. County School Board of New Kent County, 391 U. S. 430, 438 (1968).
  Instead of prompt and orderly compliance with the District Court’s mandate, however, the city of Montgomery engaged in an elaborate subterfuge to anticipate and circumvent the court’s order. Segregated recreational programs continued to be presented through the conveniently cooperating private agency of the local YMCA. All public swimming pools were closed allegedly to prevent the mixing of races. Facilities in Negro neighborhoods were not maintained equally with those in white neighborhoods. In light of these facts, made part of the record in this case, it was entirely appropriate for the District Court carefully to scrutinize any practice or policy that would tend to abandon to segregated private groups facilities normally open to members of all races on an equal basis. Here, the exclusive use and control of city recreational facilities, however temporary, by private segregated schools were little different from the city’s agreement with the YMCA to run a “coordinated” but, in effect, segregated recreational program. Such use and control carried the brand of “separate but equal” and, in the circumstances of this case, were properly terminated by the District Court.
  Particularly important is the fact that the city’s policies operated directly to contravene an outstanding school desegregation order. See Carr v. Montgomery County Board of Education, 232 F. Supp. 705 (MD Ala. 1964); 253 F. Supp. 306 (1966); 289 F. Supp. 647 (1968), aff’d as modified, 400 F. 2d 1 and 402 F. 2d 782, 784, 787 (CA5 1968), rev’d and remanded sub nom. United States v. Montgomery County Board of Education, with directions to affirm the judgment of the District Court, 395 U. S. 225 (1969). Certainly, the city’s officials were aware of this order and were responsible for seeing that no actions on their part would significantly impede the progress of school desegregation in the city. Cooper v. Aaron, 358 U. S. 1 (1958); Green v. County School Board of New Kent County, 391 U. S., at 437-438; Alexander v. Holmes County Board of Education, 396 U. S. 19, 20 (1969). Any arrangement, implemented by state officials at any level, which significantly tends to perpetuate a dual school system, in whatever manner, is constitutionally impermissible. “[T]he constitutional rights of children not to be discriminated against . . . can neither be nullified openly and directly by state legislators or state executive or judicial officers, nor nullified indirectly by them through evasive schemes for segregation whether attempted ‘ingeniously or ingenuously.’ ” Cooper v. Aaron, 358 U. S., at 17. This means that any tangible state assistance, outside the generalized services government might provide to private segregated schools in common with other schools, and with all citizens, is constitutionally prohibited if it has “a significant tendency to facilitate, reinforce, and support private discrimination.” Norwood v. Harrison, 413 U. S. 455, 466 (1973). The constitutional obligation of the State “requires it to steer clear, not only of operating the old dual system of racially segregated schools, but also of giving significant aid to institutions that practice racial or other invidious discrimination.” Id., at 467.
  Here, the city’s actions significantly enhanced the attractiveness of segregated private schools, formed in reaction against the federal court school order, by enabling them to offer complete athletic programs. The city’s provision of stadiums and recreational fields resulted in capital savings for those schools and enabled them to divert their own funds to other educational programs. It also provided the opportunity for the schools to operate concessions that generated revenue. We are persuaded, as were both the District Court and the Court of Appeals, that this assistance significantly tended to undermine the federal court order mandating the establishment and maintenance of a unitary school system in Montgomery. It therefore was wholly proper for the city to be enjoined from permitting exclusive access to public recreational facilities by segregated private schools and by groups affiliated with such schools.
  B
  Although the Court of Appeals ruled out the exclusive use of city facilities by private schools, it went on to modify the District Court order “to make clear that the City of Montgomery is not prohibited'from permitting nonexclusive access to public recreational facilities and general government services by private schools or school affiliated groups,” 473 F. 2d, at 840, or from permitting access to these facilities by private organizations that have a racially discriminatory admissions policy. Id., at 839. Upon this record, we are unable to draw a conclusion as to whether the use of zoos, museums, parks, and other recreational facilities by private school groups in common with others, and by private nonschool organizations, involves government so directly in the actions of those users as to warrant court intervention on constitutional grounds.
  It would be improper to determine at this stage the appropriateness of further relief in all the many and varied situations where facilities are used in common by school groups or used exclusively or in common by private groups. It is possible that certain uses of city facilities will be judged to be in contravention of the parks desegregation order or the school desegregation order, or in some way to constitute impermissible “state action” ascribing to the city the discriminatory actions of the groups. The record before us does not contain sufficient facts upon which to predicate legal judgments of this kind. The questions to be resolved and the decisions to be made rest upon careful identification of the different types of city facilities that are available and the various uses to which they might be put by private groups.
  The difficulties that confront us on this record are readily apparent. Under appropriate circumstances, the District Court might conclude, as it did in the instance of exclusive usé by private schools, that access in common to city facilities by private school groups would indeed contravene the school desegregation order. For example, all-white private school basketball teams might be invited to participate in a tournament conducted on public recreational facilities with desegregated private and public school teams. Because “discriminatory treatment exerts a pervasive influence on the entire educational process,” Norwood v. Harrison, 413 U. S., at 469, citing Brown v. Board of Education, 347 U. S. 483 (1954), such assistance, although proffered in common with fully desegregated groups, might so directly impede the progress of court-ordered school desegregation within the city that it would be appropriate to fashion equitable relief “adjusting and reconciling public and private needs.” Brown v. Board of Education, 349 U. S. 294, 300 (1955). The essential finding justifying further relief would be a showing of direct impairment of an outstanding school desegregation order. Cooper v. Aaron, 358 U. S., at 17; Bush v. Orleans Parish School Board, 364 U. S. 500 (1960); Brown v. South Carolina State Board of Education, 296 F. Supp. 199 (SC), aff’d, 393 U. S. 222 (1968); Poindexter v. Louisiana Financial Assistance Comm’n, 275 F. Supp. 833 (ED La. 1967), aff’d, 389 U. S. 571 (1968); Lee v. Macon County Board of Education, 267 F. Supp. 458 (MD Ala.), aff’d, sub nom. Wallace v. United States, 389 U. S. 215 (1967); Norwood v. Harrison, supra.
  Relief would also be appropriate if a particular use constitutes a vestige of the type of state-sponsored racial segregation in public recreational facilities that was prohibited in the parks decree and likewise condemned in Watson v. Memphis, 373 U. S. 526 (1963). See also Dawson v. Mayor and City Council of Baltimore, 220 F. 2d 386 (CA4), aff’d, 350 U. S. 877 (1955); Muir v. Louisville Park Theatrical Assn., 347 U. S. 971 (1954); Holmes v. City of Atlanta, 350 U. S. 879 (1955); New Orleans City Park Improvement Assn. v. Detiege, 358 U. S. 54 (1958). For example, the record contains indications that there are all-white private and all-Negro public Dixie Youth and Babe Ruth baseball leagues for children, all of which use city-provided ballfields and lighting, balls, bats, mitts, and other aid. Were the District Court to determine that this dual system came about as a means of evading the parks decree, or of serving to perpetuate the separate-but-equal use of city facilities on the basis of race, through the aid and assistance of the city, further relief would be appropriate.
  The problem of private group use is much more complex. The Court of Appeals relied on Moose Lodge No. 107 v. Irvis, 407 U. S. 163 (1972), in concluding that the use of city facilities by private clubs did not reflect a “symbiotic relationship” between government and those groups so as to constitute state action. 473 F. 2d, at 838-839.
  We feel that Moose Lodge is not fully applicable here. In that case, we generally followed the approach taken in Burton v. Wilmington Parking Authority, supra, where it was stated:
  “Owing to the very 'largeness’ of government, a multitude of relationships might appear to some to fall within the Amendment’s embrace, but that, it must be remembered, can be determined only in the framework of the peculiar facts or circumstances present.” 365 U. S., at 725-726.
  In Moose Lodge the litigation was directly against a private organization, and it was alleged that the organization’s racially discriminatory policies constituted state action. We held that there was no state action in the mere fact that the fraternal organization’s beverage bar was licensed and regulated by the State. In contrast, here, as in Burton, the question of the existence of state action centers in the extent of the city’s involvement in discriminatory actions by private agencies using public facilities, and in whether that involvement makes the city “a joint participant in the challenged activity, which, on that account, cannot be considered to have been so ‘purely private’ as to fall without the scope of the Fourteenth Amendment.” 365 U. S., at 725. Because the city makes city property available for use by private entities, this case is more like Burton than Moose Lodge. The question then is whether there is significant state involvement in the private discrimination alleged. Reitman v. Mulkey, 387 U. S. 369 (1967); Burton v. Wilmington Parking Authority, supra; Evans v. Newton, 382 U. S. 296 (1966); Moose Lodge No. 107 v. Irvis, supra. “The Court has never held, of course, that discrimination by an otherwise private entity would be violative of the Equal Protection Clause if the private entity receives any sort of benefit or service at all from the State, or if it is subject to state regulation in any degree whatever.” 407 U. S., at 173. Traditional state monopolies, such as electricity, water, and police and fire protection — all generalized governmental services — do not by their mere provision constitute a showing of state involvement in invidious discrimination. Norwood v. Harrison, 413 U. S., at 465; Moose Lodge No. 107 v. Irvis, 407 U. S., at 173. The same is true of a broad spectrum of municipal recreational facilities: parks, playgrounds, athletic facilities, amphitheaters, museums, zoos, and the like. Cf. Evans v. Newton, 382 U. S., at 302. It follows, therefore, that the portion of the District Court’s order prohibiting the mere use of such facilities by any segregated “private group, club or organization” is invalid because it was not predicated upon a proper finding of state action.
  If, however, the city or other governmental entity rations otherwise freely accessible recreational facilities, the case for state action will naturally be stronger than if the facilities are simply available to all comers without condition or reservation. Here, for example, petitioners allege that the city engages in scheduling softball games for an all-white church league and provides balls, equipment, fields, and lighting. The city’s role in that situation would be dangerously close to what was found to exist in Burton, where the city had “elected to place its power, property and prestige behind the admitted discrimination.” 365 U. S., at 725. We are reminded, however, that the Court has never attempted to formulate “an infallible test for determining whether the State . . . has become significantly involved in private discrimina^ tions” so as to constitute state action. Reitman v. Mulkey, 387 U. S., at 378. “ 'Only by sifting facts and weighing circumstances’ on a case-by-case basis can a ‘nonobvious involvement of the State in private conduct be attributed its true significance.’ ” Ibid., quoting Burton, 365 U. S., at 722. This is the task for the District Court on remand.
  III
  We close with this word of caution. It should be obvious that the exclusion of any person or group — all-Negro, all-Oriental, or all-white — -from public facilities infringes upon the freedom of the individual to associate as he chooses. Mr. Justice Douglas emphasized this in his dissent, joined by Mr. Justice Marshall, in Moose Lodge. He observed: “The associational rights which our system honors permit all white, all black, all brown, and all yellow clubs to be formed. They also permit all Catholic, all Jewish, or all agnostic clubs to be established. Government may not tell a man or woman who his or her associates must be. The individual can be as selective as he desires.” 407 U. S., at 179-180. The freedom to associate applies to the beliefs we share, and to those we consider reprehensible. It tends to produce the diversity of opinion that oils the machinery of democratic government and insures peaceful, orderly change. Because its exercise is largely dependent on the right to own or use property, Healy v. James, 408 U. S. 169, 181-183 (1972), any denial of access to public facilities must withstand close scrutiny and be carefully circumscribed. Certainly, a person’s mere membership in an organization which possesses a discriminatory admissions policy would not alone be ground for his exclusion from public facilities. Having said this, however, we must also be aware that the very exercise of the freedom to associate by some may serve to infringe that freedom for others. Invidious discrimination takes its own toll on the freedom to associate, and it is not subject to affirmative constitutional protection when it involves state action. Norwood v. Harrison, 413 U. S., at 470.
  The judgment of the Court of Appeals is therefore reversed in part. The case is remanded to that court with directions to remand it in turn to the District Court for further proceedings consistent with this opinion.
  It is so ordered.
  Prior to the institution of the suit, some of the plaintiffs had petitioned the city’s Parks and Recreation Board, and the plaintiffs and others had petitioned the city’s Board of Commissioners to provide access to the city parks for petitioners and all other Negro citizens similarly situated. The chairman of the Parks and Recreation Board replied that the Board “has no authority in this matter.” The Board of Commissioners responded, “The Commission will not operate integrated parks.” Exhibits attached to complaint filed Dec. 22, 1958, in Civil Action No. 1490-N, United States District Court for the Middle District of Alabama, Northern Division.
  Within days after petitioners filed their suit, the city authorities, by resolution effective January 1, 1959, closed all the city’s recreational parks, athletic fields, swimming facilities, and playgrounds, to all persons, white and black, and did not purport officially to reopen them until 1965. The city continued, however, to own and maintain them.
  On April 22, 1964, after the case had lain dormant for four years, the District Court ordered the file closed “without prejudice to any party to this litigation petitioning this Court for a reinstatement.”
  Petitioners’ motion, filed August 7, 1970, was styled as a “Motion to Cite Defendants for Contempt and for Relief.” On October 2, the District Court granted the further motion of the petitioners that the August 7 motion be treated as an amendment to the original complaint.
  The record in that case revealed a deliberate attempt to thwart the desegregation order of the District Court. In 1958, the city and the YMCA formed a coordination committee. It was agreed that the YMCA would not offer any program that would duplicate or conflict with one offered by the city’s recreation department. The YMCA conducted football, basketball, and track programs for all the elementary school children of the city, but not for the junior high students. The responsibility for administering junior high programs was delegated to the Recreation Department. Each elementary school supposedly was assigned to the nearest YMCA branch. Yet the District Court found that “every predominantly white school in the city is assigned to one of the three all-white branches even though the school may be closer to the Cleveland Avenue [Negro] branch. Every predominantly Negro school is, regardless of its location, assigned to the Cleveland Avenue branch.” 316 F. Supp., at 905. The YMCA also was given free use of the city’s parks, playgrounds, and lighting equipment for its various athletic programs, and free water for its swimming pools. The city did not reopen its pools after it closed the parks in 1959. “In 1957, the YMCA operated one small branch in downtown Montgomery which had less than 1,000 members. By 1960, two years after the ‘Co-ordination Committee’ had been created, it operated five branches with five swimming pools. Today the YMCA operates six branches with eight swimming pools and has approximately 18,000 members.” Id., at 908.
  The settlement agreement appears to have been aimed at providing equal recreational facilities for the Negro population of Montgomery. It specified the construction of new community centers and a new recreation center. Improvements were to be made to existing predominantly Negro facilities. The city agreed to maintain all community centers “on an equal basis and to the same manner and extent.”
  The agreement was approved by the District Court on January 29, 1971. Jurisdiction, however, was “specifically retained,” and the defendants were.ordered to file a written progress report every six months.
  The District Court's decretal provisions in full text, except for a paragraph relating to the taxation of costs, are:
  “1. That the City of Montgomery, Alabama’s policy and practice of permitting the use of city owned or operated recreational facilities by any private school, or private school affiliated group, which school or group is racially segregated or which has a racially discriminatory admissions policy be and the same is hereby declared unconstitutional.
  “2. That said City of Montgomery, Alabama, its officers, agents, servants, employees, and those acting in concert with it, be and each is hereby enjoined from permitting or in any way sanctioning the use of city owned or operated recreational facilities by any private school, or private school affiliated group, if such school or group is racially segregated or if it has a racially discriminatory admissions policy.
  “3. That said City of Montgomery, Alabama’s policy and practice of permitting the use of city owned or operated recreational facilities by any private group, club or organization which has a racially discriminatory admissions policy be and the same is hereby declared unconstitutional.
  “4. That said City of Montgomery, Alabama, its officers, agents, servants, employees and those acting in concert with it, be and each is hereby enjoined from permitting or in any way sanctioning the use of city owned or operated recreational facilities by any private group, club or organization which is not affiliated with a private school and which has a racially discriminatory admissions policy.” 337 F. Supp., at 26.
  We understand the term “exclusive use” not to include the situation where only part of a facility may be allocated to or used by a group, even though that allocation or use results in the pro tanto exclusion of others. For example, the use of two of a total of 10 tennis courts by a private school group would not constitute an exclusive use; the use of all 10 courts would. This is not to say that the use of two by a private school group would be constitutionally permissible. See discussion, infra, at 570-571, n. 10.
  Petitioners requested that the District Court take notice in this case of Smith v. Young Men’s Christian Assn., 316 F. Supp. 899 (1970), in which the same District Judge had presided. The trial court ruled from the bench that it would take judicial notice “of the evidence that was presented in the Y. M. C. A. case.” Excerpted transcript, testimony of William Chandler, Nov. 20, 1970, p. 7.
  Petitioners also requested that the District Court in this case take notice of Carr v. Montgomery County Board of Education, supra. The trial court in its reported opinion, 337 F. Supp., at 24, referred to the duty of the State’s school boards to desegregate.
  The Brethren in concurrence state that they would sustain the District Court insofar as any school-sponsored or school-directed uses of the city recreational facilities enable private segregated schools to duplicate public school operations at public expense. It hardly bears repetition that the District Court’s original injunction swept beyond these limits without the factfinding required for the prudent use of what would otherwise be the raw exercise of a court’s equitable power.
  It is by no means apparent, as our Brother BreNNAN correctly notes, which uses of city facilities in common with others would have “a significant tendency to facilitate, reinforce, and support private discrimination.” Norwood v. Harrison, 413 U. S. 455, 466 (1973). Moreover, we are not prepared, at this juncture and on this record, to assume the standing of these plaintiffs to claim relief against certain nonexclusive uses by private school groups. The plaintiffs in Norwood were parties to a school desegregation order and the relief they sought was directly related to the concrete injury they suffered. Here, the plaintiffs were parties to an action desegregating the city parks and recreational facilities. Without a properly developed record, it is not clear that every nonexclusive use of city facilities by school groups, unlike their exclusive use, would result in cognizable injury to these plaintiffs. The District Court does not have carte blanche authority to administer city facilities simply because there is past or present discrimination. The usual prudential tenets limiting the exercise of judicial power must' be observed in this case as in any other.