He became the symbolic figurehead of an anti-Soviet Russian monarchist movement, after assuming on 16 November 1924 the supreme command of all Russian forces in exile and thus of the Russian All-Military Union, which had been founded in the Kingdom of Serbs, Croats and Slovenes by Gen Pyotr Wrangel two months prior. The monarchists made plans to send agents into Russia. Conversely a top priority of the Soviet secret police was to penetrate this monarchist organization and to kidnap Nicholas. They were successful in the former, infiltrating the group with spies. (OGPU later lured the anti-Bolshevik British master spy Sidney Reilly back to the Soviet Union (1925) where he was killed.) They did not succeed however, in kidnapping Nicholas. As late as June 1927, the monarchists were able to set off a bomb at the Lubyanka Prison in Moscow.