Question: When was the political party, which along with the Socialist Workers Movement are the chief contributors to the United Left in Argentina, founded

full_context: Document 1: Front for Workers' Unity: Front for Workers' Unity (Spanish: "Frente por la Unidad de los Trabajadores" , FUT) was a Spanish party alliance formed to contest the 1977 general election by the Revolutionary Communist League (LCR), Communist Action (AC), Organization of Communist Left (OIC) and Workers' Party of Marxist Unification (POUM).
Document 2: Unity for Socialism: Unity for Socialism (Catalan: "Unitat pel Socialisme" ) was an electoral coalition in Catalonia, Spain, contesting the 1980 Catalan parliament election. The coalition represented the main groups of the non-parliamentary left in Catalonia at the time. It was constituted by the Workers Party of Catalonia (PTC), Communist Organization of Spain (Bandera Roja) (OCE(BR)), Revolutionary Communist League (LCR) and the Communist Movement of Catalonia (MCC). Manuel Gracia Luño (general secretary of PTC) was the top candidate in the Barcelona constituency, whilst Jordi Creixans (OCE(BR)) headed the Girona list, Francisco Javier Clavería (PTC) headed the Lleida list and José Semente Moya (MCC) was the top candidate in Tarragona.
Document 3: United Left (Argentina): The United Left (Spanish: Izquierda Unida ) was a political party in Argentina. It was an alliance of several groups, chiefly the Communist Party of Argentina and the Socialist Workers' Movement.
Document 4: United Left Election Committee: The United Left Election Committee was an electoral alliance in West Bengal, India, formed ahead of the 1957 West Bengal Legislative Assembly election. The Committee consisted of the Communist Party of India, the Revolutionary Socialist Party, the Praja Socialist Party, the All India Forward Bloc and the Marxist Forward Bloc. The formation of the electoral alliance was announced at a mass meeting at Shahid Minar in January 1957.
Document 5: Communist Party of Austria: The Communist Party of Austria (German: "Kommunistische Partei Österreichs" , CPA or KPÖ) is a communist party in Austria. Established in 1918 as the Communist Party of German-Austria (KPDÖ), it is one of the world's oldest Communist parties. The KPÖ was banned between 1933 and 1945 under both the Austrofascist regime and the Nazi German control of Austria after the 1938 "Anschluss". It played an important role in the Austrian resistance against the Nazis.
Document 6: Communist Party of Byelorussia: The Communist Party of Byelorussia (Russian: Коммунистическая партия Белоруссии , Belarusian: Камуністычная партыя Беларусі ), known as Communist Party (bolsheviks) of Byelorussia (Russian: Коммунистическая партия (большевиков) Белоруссии ) until 1952, was a communist party in Belarus 1918-1991, created following the Russian Revolution of 1917. It was created as part of the Russian Communist Party (bolsheviks) December 30–31, 1918 with 17,800 members. It was important in creating the Belorussian Soviet Republic in January 1919. From February 1919 until 1920 it functioned as a single organisation together with the Communist Party of Lithuania, known as the Communist Party (bolsheviks) of Lithuania and Belorussia.
Document 7: United Left (France): United Left ("Gauche unitaire", GU) was a political party in France which used to be one part of a faction (under the name "Unir" or Unite) within the Revolutionary Communist League. The party is led by Christian Picquet, a former member of the Revolutionary Communist League.
Document 8: Proletarian Party of America: The Proletarian Party of America (PPA) was a small communist political party in the United States, originating in 1920 and terminated in 1971. Originally an offshoot of the Communist Party of America, the group maintained an independent existence for over five decades. It is best remembered for carrying forward Charles H. Kerr & Co., the oldest publisher of Marxist books in America.
Document 9: Unite the Left: Unite the Left ("Unire la Sinistra") was a minority faction within the Party of Italian Communists (PdCI), a political party in Italy. Its leaders included former minister Katia Belillo and MEP Umberto Guidoni.
Document 10: Popular Unitary Action Movement: The Popular Unitary Action Movement or MAPU (Spanish: Movimiento de Acción Popular Unitario ) was a small leftist political party in Chile. It was part of the Popular Unity coalition during the government of Salvador Allende. MAPU was repressed during the dictatorship of Augusto Pinochet. In this period, some of its most radical members formed the Movimiento Juvenil Lautaro, whose leaders were political prisoners during the dictatorship and with the return to democracy. Another faction of the former members of the party joined the social democratic Party for Democracy in 1987.
Document 11: National conventions of the Communist Party USA: The Communist Party USA has held twenty nine official conventions including nomination conventions and conventions held while the party was known as the Workers Party of America, the Workers (Communist) Party of America and the Communist Political Association. There were also a number of congresses held by the earlier, often underground, organizational predecessors of the party, including the Communist Labor Party of America, the United Communist Party and two groups known as the Communist Party of America. The Communist Party's 30th National Convention took place on 13 to 15 June 2014 in Chicago.
Document 12: Communist Party USA (Provisional): The Communist Party, United States of America (Provisional) also known as the Communist Party, United States of America (Provisional Wing), Provisional Communist Party, Provisional Party, Provisional Party of Communists, Order of Lenin or simply the Formation is a Communist political party in the United States founded by Gino Perente, a controversial farm labor organizer who died in 1995. The party includes much of the leadership of the National Labor Federation (NATLFED), and may have no further substance at all. Outside estimates cap membership at between 100 and 300 core members. Those alleged to be members make no public use of the name, and have virtually no identifiable offices or centers of operations.
Document 13: Communist Party of Argentina: The Communist Party of Argentina (Spanish: "Partido Comunista de la Argentina" , also simply known as "PC") is a communist party in Argentina. It was founded in 1918.
Document 14: Communist Party of Canada (Marxist–Leninist): The Communist Party of Canada (Marxist–Leninist) (CPC (ML)) is a Canadian federal political party founded by Hardial Bains in 1970. The CPC (ML) has been registered with Elections Canada as the Marxist–Leninist Party of Canada since 1974 as the party is prohibited from using the Communist Party name in Canadian elections to avoid confusion among voters. The party developed separately and independently from the Communist Party of Canada (CPC) with its origins among students and intellectuals in Canada during the 1960s. After a period of alignment with Maoism and China, the CPC (ML) pursued a pro-Albanian line until the early 1990s when it adopted a pro-Cuba position.
Document 15: United Left (Ireland): United Left was a left-wing political party in Ireland founded in 2013. The founders were TDs Clare Daly and Joan Collins, who had been elected at the 2011 election as members of the Socialist Party and People Before Profit Alliance respectively. United Left was added to the official register of political parties in May 2013. Its registered officers were Daly, Collins, Declan Bree of Sligo County Council and Pat Dunne of Dublin City Council, all formerly of the United Left Alliance. As of December 2015, it is no longer a registered political party.
ground_truth: 1918