The Spanish Revolution was a social revolution that began at the outbreak of the Spanish Civil War in 1936, following the attempted coup to overthrow the Second Spanish Republic and arming of the worker movements and formation of militias to fight the Nationalists. It featured takeover of power at local levels by the Spanish workers' organizations and social movements, seizure and reorganization of economic facilities directed by trade union groups and local committees, and widespread implementation of socialist, more narrowly, libertarian socialist and anarchist organizational principles throughout various portions of the Republican zone, primarily Catalonia, Aragon, Andalusia, and parts of the Valencian Community.
Much of the economy of Spain was put under worker control; in anarchist strongholds like Catalonia, the figure was as high as 75%. Factories were run through worker committees, and agrarian areas became collectivized and run as libertarian socialist communes. Many small businesses, such as hotels, barber shops, and restaurants, were also collectivized and managed by their former employees. The revolutionary principles implemented with the revolution continued to evolve as much as the Republican zone existed, until the end of the civil war with the victory of the Nationalists.