Composition of the Congress: Bolsheviks – 300 delegates; Mensheviks – 68; SRs – 193; Ukrainian socialists – 7; Anarchists – 3; the Bund and Poale Zion – 10; PPS and PSD – 10; the Menshevik Internationalists – 14; National Socialists – 3; Socialist Narodniks of Lithuania – 4; independents – 36; of unknown party affiliation – 22. Total number of delegates: 670.