It is in the twenty-second session of that gathering that a chasm opens between the delegates, a split remarkable not only for its depth, but also for the seeming triviality of its catalyst. The question is whether a party member should be one who ‘recognises the party’s programme and supports it by material means and by regular personal association under the direction of one of the party organisations’, or ‘by personal participation in one of the party organisations’. Martov demands the former. Lenin stakes all on the latter

Relations between the two have been cooling for some time. Now after an intense, vigorous debate, Martov wins, twenty-eight to twenty-three. But various fits of huff and dudgeon ensue on other issues, and by the time the party leadership is to be decided, walkouts by the Jewish socialist group the Bund and by the Economist Marxists mean Martov has lost eight of his original supporters. Lenin manages to push through his choices for the Central Committee. Minority in Russian is menshinstvo, majority bolshinstvo. From these words the two great wings of Russian Marxism take their names: Martov’s Mensheviks and Lenin’s Bolsheviks.