Western Bloc of the FARC - EP The Western Bloc of the Revolutionary Armed Forces of Colombia is believed the smallest of the blocs in size , but not in military capability . It is routinely held responsible for attacks that occur in Cali and its surroundings . The specific divisions of the group are arguable . Because of the current conflict existing in the country , much of the information recovered is conflicting . Some of the believed divisions or ' fronts ' , as they are commonly called , are shown below . Many of these fronts sometimes work together towards a certain mission , while others are further divided into ' columns ' and ' companies ' with a smaller number of members . For more general information see FARC - EP Chain of Command . 6th Front . Also known as the Hernando González Acosta Front , it is composed of 400 to 500 people as of 2011 . It operates mostly in the Cauca Department and the Valle del Cauca Department . Its leader is considered , along with Tirofijo , one of the founders of FARC . On September 19 , 2008 , heavy fighting occurred between the Colombian army and the FARC ' s sixth front during an attack on Toribío , Cauca Department . On April 27 , 2013 , 17 members of the front are captured while they attempted to steal an helicopter from the Colombian armed forces . 8th Front . It is composed by up to 80 men and operates mostly in the Cauca Department and along the pacific coast . Its current leadership is unclear . 29th Front . It is composed by up to 250 men and operates mostly in the Nariño Department . It includes the mobile column " Daniel Aldana " which operate in the Tumaco department . In late April 2013 , 13 alleged members of the column are captured , and one other is killed . 30th Front . Also known as the José Antonio Páez Front , it is composed of up to 300 people . It operates mostly in the Cauca Department and the Valle del Cauca Department . The front leads drug trafficking activities in the areas near the Yurumangui river and is responsible for multiple attacks against civilians on Colombia ' s Pacific coast . On March 2011 , 10 guerillas were killed by the army , and 5 others captured . On October 2 , 2011 , 3 guerillas were killed and 2 captured . On February 11 , the 30th front attack an army base , killing 3 and injuring 18 member of the Colombian army . " Mobile column Miller Perdomo " forms a part of this front . 60th Front . It is composed of up to 60 men and operates mostly in the Cauca Department . Mobile Column Jacobo Arenas . It is composed by up to 300 men and operates mostly in the Cauca Department . The column is suspected to be responsible for an attack which killed six soldiers on February 9 , 2009 . Mobile Column Arturo Ruiz . It is one of the FARC ' s elite units , among its most notorious operations is the kidnapping of the Valle del Cauca deputies on April 11 , 2002 . Mobile Column Gabriel Galvis . Operates in Valle del Cauca . Has 110 fighters or more as of 2011 . Mobile Column Víctor Saavedra . Operates in Valle del Cauca and especially in the mountains east of Tuluá . Urban Front Manuel Cepeda Vargas . It is composed by up to 50 men and is one of the FARC ' s strongest factions in Cali .