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Ngô Đình Tung was a high-ranking official in the Cần Lao Party in the 1950s. He was the brother of Ngô Đình Diệm, who was the President of South Vietnam from 1954 to 1963. Tung was a Catholic and was seen as a conservative figure. He was involved in the crackdown on Buddhists in 1963, which led to Diệm's downfall.