626 KGB Moscow to Mexico City, 29 October 1944; 634 KGB Moscow to Mexico City, 5 November 1944. References National Security Agency Archives, VENONA Historical Monograph #4 FBI Silvermaster file, serial 3187, New York FBI memo, 1 April 1948 John Earl Haynes and Harvey Klehr, Venona: Decoding Soviet Espionage in America, Yale University Press (1999), pgs. 280–281, 282, 348, 450. 1903 births 1998 deaths Cornell University alumni American spies for the Soviet Union American people in the Venona papers American people of Russian-Jewish descent International Brigades personnel