Francisco Largo Caballero

Francisco Largo Caballero (15 October 1869 – 23 March 1946) was a Spanish politician and trade unionist who served as the prime minister of the Second Spanish Republic during the Spanish Civil War. He was one of the historic leaders of the Spanish Socialist Workers' Party (PSOE) and of the Workers' General Union (UGT). Although he entered politics as a moderate leftist, after the 1933 general election in which the conservative CEDA party won the majority, he took a more radical turn and began to advocate for a socialist revolution, materialized with the failed Revolution of 1934 in Asturias.

After the victory of the Popular Front in the 1936 Spanish general election and following the July coup, Caballero served as prime minister of Spain during the Spanish Civil War from 4 September 1936 until 17 May 1937. Exiled in France following the Republican defeat in 1939, Caballero was imprisoned in the Sachsenhausen concentration camp after the Nazi invasion of France. Provided by Wikipedia