Chavez could be a little concerned over his relationship with the FARC.

Revolutionary Armed Forces of Colombia (FARC)
From: Country Reports on Terrorism, 2004. United States Department of State, April 2005.

Comments on the content of the material should be sent to the U.S. Department of State

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Description
Established in 1964 as the military wing of the Colombian Communist Party, the FARC is Latin Americaâ??s oldest, largest, most capable, and best-equipped insurgency of Marxist origin. Although only nominally fighting in support of Marxist goals today, the FARC is governed by a general secretariat led by long-time leader Manuel Marulanda (a.k.a. "Tirofijo") and six others, including senior military commander Jorge Briceno (a.k.a. "Mono Jojoy"). Organized along military lines but includes some specialized urban fighting units. A Colombian military offensive targeting FARC fighters in their former safe haven in southern Colombia has experienced some success, with several FARC mid-level leaders killed or captured. On December 31, 2004, FARC leader Simon Trinidad, the highest-ranking FARC leader ever captured, was extradited to the United States on drug charges.

Activities
Bombings, murder, mortar attacks, kidnapping, extortion, and hijacking, as well as guerrilla and conventional military action against Colombian political, military, and economic targets. In March 1999, the FARC executed three US indigenous rights activists on Venezuelan territory after it kidnapped them in Colombia. In February 2003, the FARC captured and continues to hold three US contractors and killed one other American when their plane crashed in Florencia. Foreign citizens often are targets of FARC kidnapping for ransom. The FARC has well-documented ties to the full range of narcotics trafficking activities, including taxation, cultivation, and distribution.

Strength
Approximately 9,000 to 12,000 armed combatants and several thousand more supporters, mostly in rural areas.

Location/Area of Operation
Primarily in Colombia with some activities -- extortion, kidnapping, weapons sourcing, logistics, and R&R -- suspected in neighboring Brazil, Venezuela, Panama, Peru, and Ecuador.

External Aid
Cuba provides some medical care, safe haven, and political consultation. In December 2004, a Colombian Appeals Court declared three members of the Irish Republican Army -- arrested in Colombia in 2001 upon exiting the former FARC-controlled demilitarized zone (despeje) -- guilty of providing advanced explosives training to the FARC. The FARC often uses the Colombia/ Venezuela border area for cross-border incursions and consider Venezuelan territory as a safe haven.
http://library.nps.navy.mil/home/tgp/farc.htm