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Near the start of the movie, the FLN member who recruits Ali explains that the definition of crimes and the way they are punished are to show FLN means business, to create an atmosphere of fear in the Kasbah through which they can institute order and loyalty and to have something to define themselves against the French.
Real Life: Gillo Pontecorvo was a communist. He would not have lasted long in the kind of society the FLN wanted to create.