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In page ETA (separatist group):

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ETA changed its internal structure on several occasions, commonly for security reasons. The group used to have a very hierarchical organization with a leading figure at the top, delegating into three substructures: the logistical, military and political sections. Reports from Spanish and French police point towards significant changes in ETA's structures in its later years. ETA divided the three substructures into a total of eleven. The change was a response to captures, and possible infiltration, by the different law enforcement agencies. ETA intended to disperse its members and reduce the effects of detentions.[citation needed]