FARC In Action! is a Timeline Event that can occur at random 4 year stints.
Every year while the event is happening, there's a chance that a hostage crisis will take place on the island.
FARC stands for the Fuerzas Armadas Revolucionarias de Colombia (Revolutionary Armed Forces of Colombia), a militant communist group formed in Colombia after the events of La Violencia. The group is prone to using terrorist tactics - including politically-motivated kidnappings - to achieve their goals.