His exile over, in 1900 he moved to Western Europe, where he joined the editorial board of "Iskra", the publication of the Marxist Russian Social Democratic Labour Party (RSDLP). "Iskra"'s base was moved from Munich to London and then to Geneva, each time accompanied by Lenin. At the party's second congress, held in London in 1903, a major schism erupted between Lenin and his supporters (the Bolsheviks) and Julius Martov and his supporters (the Mensheviks); Lenin emphasised a strongly centralised party controlled largely by the leadership, whereas Martov accepted a wider party with more independence of thought. Lenin returned to Russia briefly during the Revolution of 1905, but fled again when the Tsarist authorities defeated the revolutionary forces and cracked down on dissent.