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Persecutions against the Catholic Church took place during the papacy of Pope Pius XII (1939–1958). Pius' reign coincided with World War II (1939–1945), followed by the commencement of the Cold War and the accelerating European decolonisation. During his papacy, the Catholic Church faced persecution under Fascist and Communist governments.
The Nazi persecution of the church was at its most extreme in Occupied Poland. The defeat of Fascism at the end of World War II ended one set of persecutions, but strengthened the position of Communism throughout the world, intensifying a further set of persecutions – notably in Eastern Europe, the USSR, and, later, the People's Republic of China. The Catholic Church was under attack in all Communist governed countries and lost most of its existence in Albania, Bulgaria, Yugoslavia, Romania, Communist China and the Soviet Union (including Estonia, Latvia and Lithuania).