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.
One of the 'leaders' of FARC's 6th Front. Captured in January 2012.
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.
The Mobile Column Alonso Cortés, composed by up to 50 men, also operates in this area.
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.
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.[unbalanced opinion] 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.
Jorge Neftali Umenza Velasco, or Herminsul de Jesús Velasco
1st commander. Killed in a bombardment in October 20, 2011 
Jaime Renteria Mosquera
Commander of a special unit of the 30th Front. Demobilized in December 2011 with 9 others guerrillas of the 30th Front
^FARC-EP. "Comunicado del Bloque Caribe de las FARC" February, 2007. Available online. Accessed June 10, 2007.
^Policía Nacional de Colombia. "CAPTURADO EN CALI ARLEX PORRAS GÓMEZ, SEGUNDO CABECILLA Y JEFE MILITAR DEL OCTAVO FRENTE DE LA ORGANIZACIÓN ARMADA TERRORISTA" June 30, 2006. Available online. Accessed May 23, 2007.
^Derechos Humanos de Colombia. "Bitácora de Prensa del 18 al 24 de febrero de 2003" February 23, 2003. Available online. Accessed May 23, 2007.