 Some sources claim that by the conflict's end, 20 percent of the nation's clergy had been killed.The "Execution" of the Sacred Heart of Jesus by Communist militiamen at Cerro de los Ángeles near Madrid, on 7 August 1936, was the most infamous of widespread desecration of religious property.In dioceses where the Republicans had general control, a large proportion—often a majority—of secular priests were killed.