They were trying to gain freedom from a fascist dictatorship.
Civic-military dictatorship of Uruguay
The civic-military dictatorship of Uruguay (197385), also known as the Uruguayan Dictatorship, was an authoritarian military dictatorship that ruled Uruguay for 12 years, from June 27, 1973 (after the 1973 coup d'état) until March 1, 1985. The dictatorship has been the subject of much controversy due to its violations of human rights, use of torture, and the unexplained disappearances of many Uruguayans.[2] The term "civic-military" refers to the military regime's relatively gradual usurpation of power from civilian presidents who continued to serve as head of state,[3] which distinguished it from dictatorships in other South American countries in which senior military officers immediately seized power and directly served as head of state.
The dictatorship was the culmination of an escalation of violence and authoritarianism in a traditionally peaceful and democratic country, and existed within the context of other military dictatorships in the region. It resulted in the suppression of all former political activity, including the traditional political parties. Many people were imprisoned and tortured, especially Uruguayans with left-wing sympathies.[4]
Political situation
The slow road to dictatorship started in the late 1960s. Between 1952 and 1967, the country experimented with a collective presidency. The National Council of Government had nine members, six from the majority party and three from the opposition. It provided weak leadership in the midst of a worsening economic situation.
After the re-establishment of the Presidency, the new President Óscar Diego Gestido of the Colorado Party was unable to improve economic conditions. He died in December 1967, six months after taking office. His constitutional successor, President Jorge Pacheco Areco (19671972) banned the Socialist Party of Uruguay, other leftist organizations and their newspapers, purged liberal professors from universities, and suppressed labor unions. His repressive policies, as well as economic crisis and high inflation, fueled social conflict and far-left guerrilla activity; the latter of which manifested in the form of the Tupamaros. On June 13, 1968, Pacheco declared a state of emergency. On August 14, 1968, 28 year old university student Líber Arce became the first student killed by police forces in Uruguay under the Pacheco administration. Another state of emergency was declared in August 1970, after Tupamaros killed US security expert Dan Mitrione. To coordinate their anti-guerrilla activities, the armed forces created the Joint Chiefs of Staff (Junta de Comandantes en Jefe y el Estado Mayor Conjunto) abbreviated as ESMACO. It was granted complete independence from the Ministry of Defense. [5] Another state of emergency was declared in January 1971 when the Tupamaros kidnapped UK ambassador Geoffrey Jackson. On September 9, 1971, more than 100 Tupamaros escaped from jail, prompting Pacheco to order the army to suppress all guerrilla activities.[6]
More:
https://en.wikipedia.org/wiki/Civic-military_dictatorship_of_Uruguay