After Escobar was shot and killed when fighting against the Search Bloc in 1993, several of their leaders eventually went on to become leaders of a national paramilitary alliance in Colombia, the United Self-Defense Forces of Colombia (AUC), a paramilitary death squad that was formed not only for the purpose of fighting the Cartel but also the Revolutionary Armed Forces of Colombia (FARC), a Marxist guerrilla group. The Castaño Brothers (Carlos 1965–2004, Vicente and Fidel, who went missing in 1994) were founders of several paramilitary groups and the driving force behind the AUC's creation.