Eufrosina Dvoichenko-Markov was an American citizen and spy for the New York KGB

KGB

The KGB was the commonly used acronym for the . It was the national security agency of the Soviet Union from 1954 until 1991, and was the premier internal security, intelligence, and secret police organization during that time.The State Security Agency of the Republic of Belarus currently uses the...

 Rezidentura from 1943 to 1945. Her son Sgt. Demetrius Dvoichenko-Markov of the United States Army

United States Army

The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services...

, also worked for Soviet intelligence. Eufrosina provided Soviet intelligence with information on Romanians, Carpatho-Russian

Carpathian Ruthenia

Carpathian Ruthenia is a region in Eastern Europe, mostly located in western Ukraine's Zakarpattia Oblast , with smaller parts in easternmost Slovakia , Poland's Lemkovyna and Romanian Maramureş.It is...

s and other exile groups in the United States. Dvoichenko-Markov also provided information on United States Department of State

United States Department of State

The United States Department of State , is the United States federal executive department responsible for international relations of the United States, equivalent to the foreign ministries of other countries...

 personnel with whom she had contact.

Venona

Eufrosina Dvoichenko-Markov codename in Soviet intelligence is "Masha". Dvoichenko-Markov is referenced in the following Venona project

Venona project

The VENONA project was a long-running secret collaboration of the United States and United Kingdom intelligence agencies involving cryptanalysis of messages sent by intelligence agencies of the Soviet Union, the majority during World War II...

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
• 1182 KGB New York to Moscow, 19 August 1944
• 1508 KGB New York to Moscow, 23 October 1944

Works

• Eufrosina Dvoichenko-Markov, Jefferson and the Russian Decembrists, American Slavic and East European Review, Vol. 9, No. 3. (Oct., 1950), pp. 162–168. JSTOR link
• 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