The Red Terror in Spain (Spanish: Terror Rojo en España) is the name given by historians to various acts committed "by sections of nearly all the leftist groups" such as the killing of tens of thousands of people (including 6,832 members of the Catholic clergy, the vast majority in the summer of 1936 in the wake of the military rising), as well as attacks on landowners, industrialists, and politicians, and the desecration and burning of monasteries and churches. A process of political polarisation had characterised the Spanish Second Republic – party divisions became increasingly embittered and questions of religious identity came to assume a major political significance.
Some estimates of the Red Terror range from 38,000 to 72,344 lives. - Source
Photo: Spanish leftists shooting Sacred Heart monument.