Eufrosina Dvoichenko-Markov (1901–1980) was a Russian-American history and literary scholar identified by
National Security Agency as agent Masha who worked for the
New York NKGBRezidentura from 1943 to 1945. Her son, Sgt.
Demetrius Dvoichenko-Markov of the
United States Army, is also identified by the
Venona papers as a Soviet agent, but spent the rest of his life as an academician in the United States. Masha provided Soviet intelligence with information on
Romanians,
Carpatho-Russians, and other exile groups in the United States. Masha also provided information on
United States Department of State personnel with whom she had contact.
Eufrosina Dvoichenko-Markov, Jefferson and the Russian Decembrists, American Slavic and East European Review, Vol. 9, No. 3. (Oct., 1950), pp. 162–168.
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Eufrosina Dvoichenko-Markov, The Pulkovo Observatory and Some American Astronomers of the Mid-19th Century, Isis, Vol. 43, No. 3. (Sep., 1952), pp. 243–246.
JSTOR link
Двойченко-Маркова Е. Русско-американская дружба во время Крымской войны//Морские записки. Том XII. № 2. Нью-Йорк. 1954 г. С.3-18.