Question: When was the political party, which along with the Socialist Workers Movement are the chief contributors to the United Left in Argentina, founded
Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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. [END] 
Answer: 
1918
1918