Diego Fernando Murillo Bejarano, also known as Don Berna or Adolfo Paz, is a former leader of the United SelfDefense Forces of Colombia paramilitary group operating in Colombia, as well as the leader of The Office of Envigado cartel. He started working for the Medelln Cartel and was ultimately to lead its militia wing. After internal vendettas he became one of Pablo Escobars many enemies and became part of Los Pepes an organization headed by the Castao brothers, Carlos and Fidel. The organization controlled a very powerful and bloodthirsty gang of hitmen named La Terraza . He then commanded two paramilitary blocs, the Cacique Nutivara Bloc and the Granada Heroes Bloc.
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Source: Wikipedia