This map of the Treblinka I forced-labor camp was drawn by Holocaust survivor Manfred Kort in 1946. In 1990 Kort donated the map to the United States Holocaust Memorial Musem. In March 1997, at the request of the Office of Special Investigations, the Museum sent the original drawing to Chicago to be used as evidence at the trial of one Bronislaw Hajda. At the conclusion of Hajda's trial on April 10, 1997, the U.S. Department of Justice announced that "a federal judge in Chicago has revoked the naturalized US citizenship of an Illinois man who took part in a massacre of Jews while serving as a guard at a Nazi forced-labor camp in German-occupied Poland during World War II and who subsequently concealed his activities from U.S. officials when he applied to immigrate to the United States on May 24, 1950." As this document shows, physical evidence of the Holocaust continues to have an impact on legal proceedings today.