In Spain, the five-year period following the proclamation of the Republic in April 1931 was marked by physical assaults upon the property and public ritual of the Spanish Catholic Church. These attacks were generally carried out by rural and urban anticlerical workers who were frustrated by the Republic's practical inability to tackle the Church's vast power. On July 17/18, 1936, a right-wing military rebellion divided Spain geographically, provoking the radical fragmentation of power in the territory which remained under Republican authority. The coup marked the beginning of a conflict which developed into a full-scale civil war. Anticlerical protagonists, with the reconfigured structure of political opportunities working in their favor, participated in an unprecedented wave of iconoclasm and violence against the clergy. During the first six months of the conflict, innumerable religious buildings were destroyed and almost 7,000 religious personnel were killed. To date, scholarly interpretations of these violent acts were linked to irrationality, criminality, and primitiveness. However, the reasons for these outbursts are more complex and deep-rooted: Spanish popular anticlericalism was undergoing a radical process of reconfiguration during the first three decades of the 20th century. During a period of rapid social, cultural, and political change, anticlerical acts took on new - explicitly political - meanings, becoming both a catalyst and a symptom of social change. After July 17/18, 1936, anticlerical violence became a constructive force for many of its protagonists: an instrument with which to build a new society. This book explores the motives, mentalities, and collective identities of the groups involved in anticlericalism, during the pre-war Spanish Second Republic and the Spanish Civil War. It will be is essential reading for all those interested in 20th-century Spanish history.