He joined the underground crime world during his teenage years as a member of the private militia of drug lord Gonzalo Rodríguez Gacha, aka El Mexicano.
[3] These paramilitary groups grew in number and influence and came to be called the Bloque Centauros of the United Self-Defense Forces of Colombia (AUC) under the command of Miguel Arroyave.
He survived the war for the control of the department of Casanare between the Bloque Centauros and the paramilitary group of Héctor Germán Buitrago (aka Martín Llanos), and then was blamed as the author of the death of his own boss, Miguel Arroyave by Salvatore Mancuso, who declared Guerrero a military target.
As the government of Alvaro Uribe started a peace process with the paramilitary organizations, Guerrero demobilized on April 6, 2006, turning a 1.024 weapons arsenal that included grenades, guns, and rifles,[3] but since he mistrusted the process he refused to join the remaining leaders and returned to his territory where he created the Colombian Popular Revolutionary Anti-communist Army (Spanish: Ejército Revolucionario Anticomunista de Colombia – ERPAC), and started trafficking drugs yet again.
In December 2010, as the police received information about his presence in the area of Mapiripán, Meta, to celebrate Christmas they launched a strong operation that captured various close members of his group.