In 1980, he was contacted there by the American embassy and on March 12, 1980 interviewed by the Office of Special Investigations.
In 2009, the Section was merged was with the Office of Special Investigations to form a new unit of the Criminal Division: the Human Rights and Special Prosecutions Section.
On April 8, 2005, a federal court working with evidence obtained by the Office of Special Investigations, revoked his American citizenship because of his service as a Nazi concentration camp guard.
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In the U.S. Justice Department, he was Assistant to the Solicitor General and from 1980 to 1983 Director of the Office of Special Investigations, Criminal Division, responsible for the investigation and prosecution of Nazi war criminals in the United States.