Demetrius Dvoichenko-Markov

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Demetrius Dvoichenko-Markov, was an American citizen and spy for the New York KGB Rezidentura from 1943 to 1945. His mother, Eufrosina Dvoichenko-Markov, also served Soviet intelligence during World War II. Dvoichenko-Markov was a sergeant United States Army who sent materials to the Soviet intelligence while assigned to military counterintelligence in Alaska.


Demetrius Dvoichenko-Markov codename in Soviet intelligence is "Hook". Dvoichenko-Markov is referenced in the following Venona project decryptions:

  • 894 KGB New York to Moscow, 10 June 1943
  • 627 KGB New York to Moscow, 5 May 1944
  • 864 KGB New York to Moscow, 16 June 1944
  • 1053 KGB New York to Moscow, 5 July 1945


  • John Earl Haynes and Harvey Klehr, Venona: Decoding Soviet Espionage in America, Yale University Press (1999), pg. 259, 347, 449.