Conservative Party or PSC [Ciro RAMIREZ Anzon]; Liberal Party or PL [Luis Guillermo VELEZ]; Patriotic Union or UP is a legal political party formed by Revolutionary Armed Forces of Colombia or FARC and Colombian Communist Party or PCC [Jaime CAICEDO]; 19 of April Movement or M-19 [Antonio NAVARRO Wolff] Political pressure groups and leaders: two largest insurgent groups active in Colombia - National Liberation Army or ELN and Revolutionary Armed Forces of Colombia or FARC; largest paramilitary group is United Self-Defense Groups of Colombia or AUC