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In 1918, Sidney Reilly conducted anti-Bolshevik missions in Moscow. His work was done under the auspices of MI6, the British intelligence service. Reilly was one of the first British agents to operate in Russia after the October Revolution. He was tasked with gathering intelligence on the Bolsheviks and their plans. He also worked to undermine the Bolshevik regime by spreading propaganda and supporting anti-Bolshevik groups.