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Philip Berrigan was an American Roman Catholic priest, social activist, and anti-war protester. He was a leading figure in the anti-war movement of the 1960s and 1970s, and was involved in a number of acts of civil disobedience, including the Catonsville Nine protest and the Harrisburg Seven trial. Berrigan's activism was primarily focused on nuclear disarmament, and he was a vocal critic of the Vietnam War and the arms race.