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
Los Pepes Los Pepes Los Pepes, a name derived from the Spanish phrase "Perseguidos por Pablo Escobar"("Persecuted by Pablo Escobar"), was a short-lived vigilante group composed of enemies of Pablo Escobar. They waged a small-scale war against the Medellín Cartel in the early 1990s, which ended in 1993 following the death of Escobar. There are reports that Los Pepes had ties to some members of the Colombian National Police, especially the Search Bloc (Bloque de Búsqueda), with whom they exchanged information in order to execute their activities against Escobar. According to documents released to the public by the U.S. Central Intelligence Agency