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In page Religious persecution:

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State atheism was first practiced for a brief period in Revolutionary France[citation needed] and later it was practiced in Revolutionary Mexico and Marxist-Leninist states. The Soviet Union had a long history of state atheism,[3] in which social success largely required individuals to profess atheism, stay away from churches and even vandalize them; this attitude was especially militant during the middle Stalinist era from 1929 to 1939.[4][5][6] The Soviet Union attempted to suppress religion over wide areas of its influence, including places like central Asia,[7] and the post-World War II Eastern bloc. One state within that bloc, the Socialist People's Republic of Albania under Enver Hoxha, went so far as to officially ban all religious practices.[8]