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In page Pan-Slavism:

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During the time of the Soviet Union, Bolshevik teachings viewed Pan-Slavism as a reactionary element associated to the Russian Empire.[1] As a result, Bolsheviks viewed it as contrary to their Marxist ideology. Pan-Slavists even faced persecution during the Stalinist repressions in the Soviet Union (see Slavists case). Nowadays, ultranationalist parties like the Russian National Unity party advocate for a Russian-dominated 'Slavic Union'.[citation needed]