Kurt Frederick Ludwig (1903-?) was a German spy and the head of the "Joe K" spy ring in the United States in 1940-41.
The ring was known as Joe K because it was the signature used in letters sent to Berlin addresses giving information on Allied shipping in New York Harbor. Ludwig also used the code name Fouzie — and at least 50 to 60 other aliases, both male and female.
Read more about Kurt Frederick Ludwig: Early Life and Career, Setting Up The Ring, The Search For The Spy Ring, An Accident in Times Square, Investigation, Surveillance, Associates, Flight and Capture, Trial and Conviction
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