All but one member of the RSDLP Central Committee were arrested in Moscow in early 1905. The remaining member, with the power of appointing a new committee, was won over by the Bolsheviks. The lines between the Bolsheviks and the Mensheviks hardened in April 1905 when the Bolsheviks held a Bolsheviks-only meeting in London, which they called the 3rd Party Congress. The Mensheviks organised a rival conference and the split was thus finalized.