He was a member of the RSDLP (b) regional committee from 1915 to 1917 and was arrested for revolutionary activities in 1916 and later sentenced to 10 years of hard labour.

Then he became chairman of the Board of State Stores and Stationery in Petrograd and from the fall of 1918 to January 1919, he headed the department of internal trade of the Economic Council of the Union of Communes of the Northern Region.

From September 1920 to 14 April 1921 he was Chairman of the Petrograd Provincial Cheka, at the same time he was Head of the Special Department for the Protection of the Border with Finland  and Implemented the policy of the Red Terror.

[7] In November 1929, together with a group of Leningrad party workers he opposed Sergei Kirov, accusing him of collaborating with the "left bourgeois press" in 1917.

Their accusation was examined in a meeting of the Politburo and Presidium of the Central Control Commission and were found to be defamatory.

[9] On 17 March 1956 Komarov was rehabilitated by the decision of the Military Collegium of the USSR Supreme Court.