In February 1917, he was arrested in Nesvizh together with several Jewish soldiers on a false espionage charge. Released in the days of the February Revolution. In March 1917, as a delegate of the Southwestern Front, he was sent to Petrograd. On April 14, 1917 he was elected to the Petrograd Committee of the Russian Social-Democratic Labor Party (Bolsheviks). Delegate of the 6th Congress of the Russian Social Democratic Labour Party (Bolsheviks). Chairman of the 1st City District Committee of the Russian Social-Democratic Labor Party (Bolsheviks) in Petrograd, member of the military section of the Petrograd Soviet. On May 27, 1917 he was elected a member of the Central Executive Committee of the Council of Workers' and Soldiers' Deputies of Petrograd.