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Kayorov was a working class Bolshevik militant who joined the Russian Social Democratic Labour Party in 1900, and adhering to the Bolshevik faction from 1903. By the time of the February Revolution, he was working in the Erikson factory in Vyborg, St Petersburg. When Vladimir Lenin was forced into hiding during the July Days, the first hiding place he used was Kayurov's apartment. During the Russian Civil War, he led a detachment of Petrograd workers on the Kazan Front. He was on the General Staff of the Fifth Army in charge of the political section.
- Haupt, Georges & Marie, Jean-Jacques (1974), Makers of the Russian revolution, London: George Allen & Unwin, p. 222