structural:summarization, information:classification, stylistic:tone
Munich, London, and Geneva: 1900–1905

After his exile, Lenin settled in Pskov in early 1900. There, he began raising funds for a newspaper, Iskra (Spark), a new organ of the Russian Marxist party, now calling itself the Russian Social Democratic Labour Party (RSDLP). In July 1900, Lenin left Russia for Western Europe; in Switzerland he met other Russian Marxists, and at a Corsier conference they agreed to launch the paper from Munich, where Lenin relocated in September. Containing contributions from prominent European Marxists, Iskra was smuggled into Russia, becoming the country's most successful underground publication for 50 years. He first adopted the pseudonym Lenin in December 1901, possibly based on the Siberian River Lena; he often used the fuller pseudonym of N. Lenin, and while the N did not stand for anything, a popular misconception later arose that it represented Nikolai. Under this pseudonym, in 1902 he published his most influential publication to date, the pamphlet What Is to Be Done?, which outlined his thoughts on the need for a vanguard party to lead the proletariat to revolution.

Nadya joined Lenin in Munich and became his secretary. They continued their political agitation, as Lenin wrote for Iskra and drafted the RSDLP programme, attacking ideological dissenters and external critics, particularly the Socialist Revolutionary Party (SR), a Narodnik agrarian-socialist group founded in 1901. Despite remaining a Marxist, he accepted the Narodnik view on the revolutionary power of the Russian peasantry, accordingly, penning the 1903 pamphlet To the Village Poor. To evade Bavarian police, Lenin moved to London with Iskra in April 1902, where he befriended fellow Russian-Ukrainian Marxist Leon Trotsky. Lenin fell ill with erysipelas and was unable to take such a leading role on the Iskra editorial board; in his absence, the board moved its base of operations to Geneva.

The second RSDLP Congress was held in London in July 1903. At the conference, a schism emerged between Lenin's supporters and those of Julius Martov. Martov argued that party members should be able to express themselves independently of the party leadership; Lenin disagreed, emphasising the need for a strong leadership with complete control over the party. Lenin's supporters were in the majority, and he termed them the "majoritarians" (bol'sheviki in Russian; Bolsheviks); in response, Martov termed his followers the "minoritarians" (men'sheviki in Russian; Mensheviks). Arguments between Bolsheviks and Mensheviks continued after the conference; the Bolsheviks accused their rivals of being opportunists and reformists who lacked discipline, while the Mensheviks accused Lenin of being a despot and autocrat. Enraged at the Mensheviks, Lenin resigned from the Iskra editorial board and in May 1904 published the anti-Menshevik tract One Step Forward, Two Steps Back. The stress made Lenin ill, and to recuperate he holidayed in Switzerland. The Bolshevik faction grew in strength; by spring 1905, the whole RSDLP Central Committee was Bolshevik, and in December they founded the newspaper Vperyod (Forward).