President Juan María Bordaberry. President Bordaberry brought the Army in to combat the guerrillas of the Tupamaros Movement of National Liberation (MLN), which was led by Raúl Sendic. After defeating the Tupamaros, the military seized power in 1973. Torture was effectively used to gather information needed to break up the MLN and also against trade union officers, members of the Communist Party and even regular citizens. Torture practices extended until the end of Uruguayan dictatorship in 1985. Uruguay soon had the highest per capita percentage of political prisoners in the world. The MLN heads were isolated in improvised prisons and subjected to repeated acts of torture. Emigration from Uruguay rose drastically as large numbers of Uruguayans looked for political asylum throughout the world. Bordaberry was finally removed from his "president charge" in 1976. He was first succeeded by Alberto Demicheli. Subsequently, a national council chosen by the military government elected Aparicio Méndez. In 1980, in order to legitimize their position, the armed forces proposed a change in the constitution, to be subjected to a popular vote by a referendum. The "No" votes against the constitutional changes totaled 57.2 percent of the turnout, showing the unpopularity of the de facto government that was later accelerated by an economic crisis. In 1981, General Gregorio Álvarez assumed the presidency. Massive protests against the dictatorship broke out in 1984. After a 24-hour general strike, talks began, and the armed forces announced a plan for return to civilian rule. National elections were held later in 1984. Colorado Party leader Julio María Sanguinetti won the presidency and, following the brief interim Presidency of Rafael Addiego Bruno, served from 1985 to 1990. The first Sanguinetti administration implemented economic reforms and consolidated democratization following the country's years under military rule. Nonetheless, Sanguinetti never supported the human rights violations accusations, and his government did not prosecute the military officials who engaged in repression and torture against either the Tupamaros or the MLN. Instead, he opted for signing an amnesty treaty called in Spanish "Ley de Amnistia". Around 180 Uruguayans are known to have been killed during the 12-year military rule from 1973 to 1985. Most were killed in Argentina and other neighboring countries, with only 36 of them having been killed in Uruguay. A large number of those killed were never found, and the missing people have been referred to as the "disappeared", or "desaparecidos" in Spanish. Recent history