Colombian conflict dialogue, but President Barco sent an ultimatum to the guerrillas and demanded that they immediately disarm or face military retaliation. Regional guerrilla and Army skirmishes created a situation where each violation of the ceasefire rendered it null in each location, until it was rendered practically nonexistent. By 1990, at least 2,500 members of the FARC-founded Patriotic Union had been murdered, according to historian Daniel Pecáut, leading up to that year's assassination of presidential candidate Bernardo Jaramillo Ossa. The Colombian government initially blamed drug lord Pablo Escobar for the murder but journalist Steven Dudley argues that many in the UP pointed
United States and state-sponsored terrorism MAS worked together to create a new paramilitary organization known as "Perseguidos por Pablo Escobar" ("People Persecuted by Pablo Escobar", PEPES) with the purpose of tracking down and killing Pablo Escobar and his associates. The leader of the organization was Fidel Castaño. The Calí cartel provided $50 million for weapons, informants, and assassins, with in hope of wiping out their primary rivals in the cocaine business. Both Colombian and U.S. government agencies (including the DEA, CIA and State Department) provided intelligence to the PEPES. The Institute for Policy Studies is searching for details of connections the CIA and DEA had