He was one of the organizers and an active participant in the uprising of the Left Socialist Revolutionaries on July 6–7, 1918 in Moscow. After the defeat of the uprising, he went into an illegal position, in December 1918, he left for Ukraine. Sentenced in absentia to 3 years in prison. In February 1919, in Kharkov, he was arrested by the Extraordinary Commission, taken to Moscow, and released in October of the same year. Later he abandoned the struggle against the Bolsheviks. Since 1921, he worked as a lawyer in various institutions of Kharkov.