At the Fourth Congress of the Russian Social Democratic Labor Party in 1906, the organizational unity of the party was temporarily restored. At the Fifth Congress, the Central Committee was elected, which, due to disagreements between the Bolsheviks and the Mensheviks, turned out to be unworkable, and the Bolshevik Center, headed by Vladimir Lenin, which was created during the Congress by Bolshevik delegates at one of its factional meetings, arbitrarily took over the leadership of the Bolshevik organizations of the party.