Stromberg v. California , 283 U.S. 359 ( 1931 ) , was a United States Supreme Court case in which the Court ruled 7 -- 2 that a 1919 California statute banning red flags was unconstitutional .
Court violated the First and Fourteenth Amendments to the United States Constitution .
Stromberg v. California , 283 U.S. 359 ( 1931 ) , was a United States Supreme Court case in which the Court ruled 7 -- 2 that a 1919 California statute banning red flags was unconstitutional because it violated the First and Fourteenth Amendments to the United States Constitution .