Tupamaros

Formed in the early 1960s, the MLN-T sought to create a revolutionary state through armed struggle, taking inspiration from the 1953-59 Cuban Revolution led by Fidel Castro. However, unlike the latter, it conducted its operations in urban areas. The organization gained notoriety for its violent acts of sabotage, bank and armory robberies, assassinations of military and police officers, bombings, and kidnappings of judges, businessmen, diplomats and politicians.
The MLN-T is inextricably linked to its most important leader, Raúl Sendic, and his brand of Marxist politics. José Mujica, who later became President of Uruguay, was also a member. 300 Tupamaros died either in action or in prisons (mostly in 1972), according to officials of the group. About 3,000 Tupamaros were also imprisoned. Provided by Wikipedia