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In page ETA (separatist group):

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ETA's armed operations were organized in different taldes (groups or commandos), generally composed of three to five members, whose objective was to conduct attacks in a specific geographic zone.[citation needed] The taldes were coordinated by the cúpula militar ("military cupola"). To supply the taldes, support groups maintained safe houses and zulos (small rooms concealed in forests, garrets or underground, used to store arms, explosives or, sometimes, kidnapped people; the Basque word zulo literally means "hole"). The small cellars used to hide the people kidnapped are named by ETA and ETA's supporters "people's jails".[2] The most common commandos were itinerant, not linked to any specific area, and thus were more difficult to capture.[3]