Anarcho-Syndicalism helped to spark what event which took place during the Spanish Civil War?
Anarcho-Syndicalism (book):  Rocker penned this political and philosophical work in 1937, at the behest of Emma Goldman, as an introduction to the ideals fueling the Spanish social revolution and resistance to capitalism and fascism the world over. Spanish Revolution of 1936: The Spanish Revolution was a workers' social revolution that began during the outbreak of the Spanish Civil War in 1936 and resulted in the widespread implementation of anarchist and more broadly libertarian socialist organizational principles throughout various portions of the country for two to three years, primarily Catalonia, Aragon, Andalusia, and parts of the Valencian Community.
The Spanish Revolution