brutally repressed demonstrations. In 1969 they occupied the city of Pando. The Tupamaro movement engaged then in political kidnappings, "armed propaganda" and assassinations. Of particular note are the kidnapping of powerful bank manager and of the British ambassador to Uruguay, Geoffrey Jackson, as well as the assassination of Dan Mitrione, a U.S. FBI agent that was also working for the CIA (via the Agency for International Development's Office of Public Safety), who the Tupamaros learned was advising the Uruguayan police in torture and other security work. The Tupamaros peaked as a guerrilla group in 1970 and 1971. During this period they made liberal use of their Cárcel del Pueblo (or People's Prison) where they held those that they kidnapped and interrogated them, before making the results of these interviews public. A number of these hostages were later ransomed for considerable sums of money, including the Brazilian Consul in Montevideo, . In September 1971 over 100 imprisoned Tupamaros escaped the Punta Carretas prison by digging a hole across their cells and then a tunnel that led from the floor of one ground-level cell to the living room of a nearby home. As a result of this, the government summoned the military to prepare a counter-insurgency campaign to suppress the MLN. Nonetheless, in 1972 the group was quickly crippled by a series of events. First, it had started to engage in political violence since 1970, a choice that weakened its popular support. Second, the group responded to the assassination and/or disappearance of four Tupamaros on the part of illegal parapolice squads with a wave of high-profile assassinations that concentrated political opposition against them. Later on, the MLN directly attacked the military and killed a number of soldiers. The army's response was swift; it included the heavy use of torture and the flipping of high-ranking Tupamaros, including Héctor Amodio Pérez, towards collaborating with them. The Tupamaros collapsed in mid-1972, with the army killing many of them and capturing a majority of the rest. Shortly after defeating the MLN the military successively confronted the independence of the judiciary in October 1972, of the civilian executive branch in February 1973, and lastly the independence of the parliament in June 1973. On this latter occasion, it completed its coup d'état by deploying armored vehicles in the capital and shutting down the legislative branch by request of the Uruguayan President. Nine Tupamaros were specially chosen to remain