Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Duquesne Spy Ring is the largest espionage case in United States history that ended in convictions. On January 2, 1942, 33 members of a German spy ring headed by Frederick "Fritz" Joubert Duquesne were sentenced to serve a total of over 300 years in prison. They were convicted after a lengthy espionage investigation by the Federal Bureau of Investigation (FBI). Of those arrested on the charge of espionage, 19 pleaded guilty. The 14 men who entered pleas of not guilty were brought to jury trial in Federal District Court, Brooklyn, New York, on September 3, 1941; and they were all found guilty on December 13, 1941.

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