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The Combat Organization of Anarcho-Communists (Russian: Боевая организация анархо-коммунистов, romanized: Boyevaya organizatsiya anarkho-kommunistov; BOAK) is an Eastern European underground anarcho-communist organization. It aims for social revolution and libertarian socialist society. According to The Insider, the group has become "the most active 'subversive' force" in Russia since the start of the 2022 Russian invasion of Ukraine.