On January 2, 1942, thirty-three members of a Nazi Germanespionage network were sentenced to serve a combined total of over 300 years in federal prison. This dramatic conclusion to what remains the largest espionagecase in United States history that ended in convictions marked a decisive victory for American counterintelligence on the eve of the nation's entry into World War II. The Duquesne Spy Ring, named after its colorful leader Frederick "Fritz" Joubert Duquesne, represented Nazi Germany's most ambitious attempt to gather military intelligence and conduct sabotage operations on American soil.