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Committees for the Defense of the Revolución

The CDR is everywhere in Cuba. Fidel set it up in 1960 and proclaimed it "a collective system of revolutionary vigilance," established so that the government knows who lives on every block, what they do, what relations they have, in what activities are they involved, and with whom they meet.

Basically it's a vast nationwide spy network - neighbors spying on and reporting on neighbors. It's creepy, it's firmly ingrained, and it's not going to go away anytime soon even if Fidel and Raul were both to drop dead tomorrow.