How William Sebold Took Down The Largest Nazi Spy Ring In U.S. History

How a civilian engineer became a World War II spy — twice — and stopped the Nazis that had infiltrated America’s borders.

William Sebold Duquesne Spy Ring

Double-agent William Sebold talks with Captain Fritz Joubert Duquesne, German spy, who was unaware that FBI agents were taping the whole episode behind a two-way mirror. FBI/Library of Congress/Wikimedia Commons

William Sebold never planned on becoming a spy, but fate had different plans.

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