Convicted members of Duquesne Spy Ring

The Duquesne Spy Ring is the largest espionage case in United States history that ended in convictions. A total of 33 members of a German espionage network Frederick Joubert Duquesne aka Fritz Joubert Duquesne FBI file photo. Born in Cape Colony, South Africa, on September 21, 1877, and naturalized a…

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