Mikhail Tkach, also Michal Tkacz, Michael J. Tkach, and M. Nastivsky, (b. 18 October 1891, d. ? ) born at Mastisiw, Poland, of Ukrainian parents, and arrived in the United States at New York City on November 25, 1909, under the name Michal Tkacz. Tkach's wife, Yeroslava, was born at Slatchev, Poland, and entered the U.S. in 1913. The Tkach's lived in New York City from 1922 onwards. Tkach became a naturalized U. S. citizen in New York City on Dec. 8 1936.
Tkach had long been active in the Communist Party of the United States (CPUSA) and was editor of the Ukrainian Daily News, the leading Ukrainian Communist newspaper in the U.S. As early as 1923, under the name M. Nastivsky, Tkach was an organization member to the Society for Technical Aid to Soviet Russia. Elizabeth Bentley told the FBI that Jacob Golos in 1941 and 1942 received considerable information concerning the Ukrainian nationalism movement in the United States which he considered of great importance, from Mikhail Tkach. Golos told Bentley much of the information was secured by Tkach from one W. J. Stepankowski, who for a time worked as an investigator for Golos. Tkach was elected president in July 1944 of the Ukrainian Section of the International Workers Order, the leading Communist front in the foreign language field. The Ukraniain Daily News was by that time published by the Ukrainian Section of the IWO.
Tkach supervised a small network of American communists working as agents of the Soviet Union. Tkach's daughter, Ann Sidorovich, and her husband, Michael Sidorovich, were part of Julius Rosenberg's espionage network. Tkach's agent handler was SELIM KHAN, or KHAN, thought to be Avram Landy who also had contact with Albert Kahn, Eufrosina Dvoichenko-Markov, Walter Bernstein Bill Gebert. Tkach was investigated under the Internal Security Act investigation by the FBI New York Field Division and his was considered a key figure in Communist subversion by that division.
Venona 1056 KGB New York to Moscow, 3 July 1943; 823 KGB New York to Moscow, 7 June 1944; 881 KGB New York to Moscow, 20 June 1944; 1076 KGB New York to Moscow, 29 July 1944; 202 KGB New York to Moscow, 10 February 1945; 116 KGB Moscow to New York, 9 February 1945; 143 KGB Moscow to New York, 15 February 1945.
- Elizabeth Bentley, Out of Bondage (New York, NY: Devin-Adair, 1951), pg. 108.
- Elizabeth Bentley deposition, 30 November 1945, FBI file 65–14603.
- FBI Silvermaster file, pgs. 478, 482, 483 (PDF pgs. 79, 83, 84).
- John Earl Haynes and Harvey Klehr, Venona: Decoding Soviet Espionage in America (New Haven: Yale University Press, 1999), pgs. 239, 259, 303.