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He joined the ''[[Cheka]]'' in 1920 and served in its internal security section.  In 1923 he was appointed as the chief of economic division [[OGPU]] in Vladivostok and organized the fight with the smuggling of narcotics and weapons from Europe to China. In 1925 he transferred to foreign intelligence. In 23 years of service, 13 years were on the ''Illegal'' work in different countries.  

He joined the ''[[Cheka]]'' in 1920 and served in its internal security section.  In 1923 he was appointed as the chief of economic division [[OGPU]] in Vladivostok and organized the fight with the smuggling of narcotics and weapons from Europe to China. In 1925 he transferred to foreign intelligence. In 23 years of service, 13 years were on the ''Illegal'' work in different countries.  

Served as a legal officer in China (1925), a legal officer in Finland (1926), ''Illegal'' [[Rezident]] in Denmark and Germany (1927–1929) posing as a Czechoclovak citizen, an ''Illegal'' Rezident in France (1929–1933), and an ''Illegal'' Rezident in Germany (1933–1937) after Hitler came to power. In 1937 Zarubin returned to the USSR for work with the KGB's central apparatus and was awarded the Order of the Red Banner for his work in creating the underground antifascist groups.

Served as a legal officer in China (1925), a legal officer in Finland (1926), ''Illegal'' [[Rezident]] in Denmark and Germany (1927–1929) posing as a Czechoslovak citizen, an ''Illegal'' Rezident in France (1929–1933), and an ''Illegal'' Rezident in Germany (1933–1937) after Hitler came to power. In 1937 Zarubin returned to the USSR for work with the KGB's central apparatus and was awarded the Order of the Red Banner for his work in creating the underground antifascist groups.

From 1939 to 1940 he was one of [[NKVD]]'s officers in Kozelsk camp for Polish POWs. In Kozelsk his task was to investigate the Polish POWs in the camp. After most of the POWs were massacred in the [[Katyn massacre|Katyn Forest]] he was reassigned to other duties.  

From 1939 to 1940 he was one of [[NKVD]]'s officers in Kozelsk camp for Polish POWs. In Kozelsk his task was to investigate the Polish POWs in the camp. After most of the POWs were massacred in the [[Katyn massacre|Katyn Forest]] he was reassigned to other duties.  

Lieutenant Colonel [[Vassili D. Mironov]] was a subordinate of [[KGB]] North American [[Rezident]] [[Vasili Zarubin]] during [[World War II]].  While working in the [[United States]], Mironov used the covername Markov.

Lieutenant Colonel [[Vassili D. Mironov]] was a subordinate of [[KGB]] North American [[Rezident]] [[Vasili Zarubin]] during [[World War II]].  While working in the [[United States]], Mironov used the covername Markov.

Mironov evidentally was displeased with his superior and other KGB Officers working in the KGB Rezidentura, and denounced Zarubin and others in anonymous letters to both [[Josef Stalin]] and [[FBI]] Director [[J. Edgar Hoover]].  The letter caused Zarubin's recall to Moscow. The investigation against him and his wife, [[Elizabeth Zarubina]], lasted six months and established that all his contacts were legitimate and valuable, and that Zarubin was not working with the FBI.<ref>Pavel Sudoplatov, with Anatoli Sudoplatov, Jerrold L. and Leona P. Schecter, ''Special Tasks: Memoirs of an Unwanted Witness and Soviet Spymaster'' (New York: Little, Brown, 1994), pp. 196-197.</ref>

Mironov evidently was displeased with his superior and other KGB Officers working in the KGB Rezidentura, and denounced Zarubin and others in anonymous letters to both [[Josef Stalin]] and [[FBI]] Director [[J. Edgar Hoover]].  The letter caused Zarubin's recall to Moscow. The investigation against him and his wife, [[Elizabeth Zarubina]], lasted six months and established that all his contacts were legitimate and valuable, and that Zarubin was not working with the FBI.<ref>Pavel Sudoplatov, with Anatoli Sudoplatov, Jerrold L. and Leona P. Schecter, ''Special Tasks: Memoirs of an Unwanted Witness and Soviet Spymaster'' (New York: Little, Brown, 1994), pp. 196-197.</ref>

The anonymous letter drafted on a Russian typewriter was mailed in Washington in August 1943.  The original text in Russian was addressed to "Mr. Guver."  It identifies Soviet "intelligence officers and operations that stretched from Canada to Mexico."  This extraordinary note denounced Zarubin and 10 other [[KGB]] officers in North America, along with two of their assets.  FBI Special Agents quickly concluded that the letter was genuine and largely accurate, although they gave little credence to its claim of passing secrets to Japan.  

The anonymous letter drafted on a Russian typewriter was mailed in Washington in August 1943.  The original text in Russian was addressed to "Mr. Guver."  It identifies Soviet "intelligence officers and operations that stretched from Canada to Mexico."  This extraordinary note denounced Zarubin and 10 other [[KGB]] officers in North America, along with two of their assets.  FBI Special Agents quickly concluded that the letter was genuine and largely accurate, although they gave little credence to its claim of passing secrets to Japan.