text: The leading committee comprised 7 to 11 individuals, and ETA's internal documentation referred to it as , an abbreviation of  (directorial committee). There was another committee named  that functioned as an advisory committee. The eleven different substructures were: logistics, politics, international relations with fraternal organisations, military operations, reserves, prisoner support, expropriation, information, recruitment, negotiation, and treasury.
  ETA's armed operations were organized in different s (groups or commandos), generally composed of three to five members, whose objective was to conduct attacks in a specific geographic zone. The s were coordinated by the  ("military cupola"). To supply the s, support groups maintained safe houses and  (small rooms concealed in forests, garrets or underground, used to store arms, explosives or, sometimes, kidnapped people; the Basque word  literally means "hole"). The small cellars used to hide the people kidnapped are named by ETA and ETA's supporters "people's jails". The most common commandos were itinerant, not linked to any specific area, and thus were more difficult to capture.
  Among its members, ETA distinguished between / ("legal ones"), those members who did not have police records and lived apparently normal lives;  ("liberated members") known to the police that were on ETA's payroll and working full-time for ETA; and  ("supporters") who just gave occasional help and logistics support to the group when required.