 Complete the following phrase:  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 