Spanish Civil War: Largo Caballero reshuffles his war cabinet, persuading the anarcho-syndicalist CNT to join the government.

The Spanish Civil War was fought from 1936 to 1939 between the Republicans and the Nationalists. Republicans were loyal to the left-leaning Popular Front government of the Second Spanish Republic and included socialists, anarchists, communists and separatists. The opposing Nationalists who established the Spanish State were an alliance of fascist Falangists, monarchists, conservatives, and traditionalists supported by Nazi Germany and Fascist Italy and led by a military junta among whom General Francisco Franco quickly achieved a preponderant role. Due to the international political climate at the time, the war was variously viewed as class struggle, a religious struggle, or a struggle between dictatorship and republican democracy, between revolution and counterrevolution, or between fascism and communism. The Nationalists won the war, which ended in early 1939, and ruled Spain until Franco's death in November 1975.

Francisco Largo Caballero 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.

A cabinet reshuffle or shuffle occurs when a head of government rotates or changes the composition of ministers in their cabinet, or when the head of state changes the head of government and a number of ministers. They are more common in parliamentary systems than in systems where cabinet heads must be confirmed by a separate legislative body, and occur frequently in autocratic systems.