Союз русского народа
According to multiple Russian sources, since December 12, 1917, Dubrovin lived in Moscow and worked as a doctor in the 1st Lefortovo Soviet ambulance station. Arrested by the All-Russian Extraordinary Commission (Cheka) on October 21, 1920. The documents of the case indicate that Dubrovin “from 1905 to 1917 was the chairman of the "Union of the Russian People", which fought against the liberation movement in Russia. On October 30, 1920, the accusation of counter-revolution was added to this and Dubrovin was personally interrogated members of the Presidium of the Cheka Vyacheslav Menzhinsky, Martin Latsis and B.M. Futoryan.