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John Dolibois immigrated to the United States in 1931 at the age of 13. After graduating from college, Dolibois joined the 16th Armored Division of the US Army. Due to his German language skills, he became involved in military intelligence. He returned to Europe in this capacity toward the end of World War II. Dolibois interrogated German prisoners of war, including leading Nazis, in preparation for the postwar trials of war criminals. He was later appointed US ambassador to Luxembourg, his birthplace.
Ben was born in a small village in the Carpathian Mountains of Transylvania in Romania. When he was an infant, his family moved to the United States. Ben attended Harvard University, where he studied criminal law. Ben graduated from Harvard University Law School in 1943. He joined a US anti-aircraft artillery battalion that was training in preparation for an Allied invasion of western Europe. At the end of World War II in Europe, Ben was transferred to the war crimes investigation branch of the US Army. He was charged with gathering evidence against and apprehending alleged Nazi war criminals. He ultimately became chief US prosecutor in The Einsatzgruppen Case of the Subsequent Nuremberg Proceedings.