Revolutionary Spain refers to a period when of the Spanish Civil War where much of the eastern half of Spain began experimenting with libertarian socialist ideas with around 7,000,000-8,000,000 people from 1936 to 1939. Making it the largest experiment in libertarian socialist politics in the last 100 years. The extent, effectiveness, sustainability, economics, implications and lessons of the revolution have been heavily debated since the 1930s.