William G. Sebold
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William G. Sebold was a spy in the United States during World War II who was working for the Abwehr, the German foreign information organization. He had been blackmailed into espionage by the Gestapo and was code-named TRAMP.
However, he was also working for the United States as a counterspy against Germany. Through Sebold the US was able to identify dozens of enemy agents in the United States, Mexico and South America.
Sebold operated a clandestine radio station on Long Island, New York that was secretly managed by the FBI. His espionage contacts sent hundreds of messages through this source and allowed the United States access to German messages to discover the Abwehr's interests for Britain and France. In June of 1941 all of Sebold's activities were stopped when the US arrested and convicted thirty-three German agents detected as a result of his activities.
The trial ended in December of 1941 and Sebold disappeared after a short career as one of America's most successful double agents.
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