Anticlericalism has at times been violent, leading to murders and the desecration, destruction and seizure of Church property. Anticlericalism in one form or another has existed throughout most of Christian history, and it is considered to be one of the major popular forces underlying the 16th century reformation. Some of the philosophers of the Enlightenment, including Voltaire, continually attacked the Catholic Church, both its leadership and its priests, claiming that many of its clergy were morally corrupt. These assaults in part led to the suppression of the Jesuits, and played a major part in the wholesale attacks on the very existence of the Church during the French Revolution in the Reign of Terror and the program of dechristianization. Similar attacks on the Church occurred in Mexico and Portugal since their 1910 revolutions and in Spain during the twentieth century.