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  russian revolution leads to communist power in russia
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  Tsar Nicholas II supposedly assassinated by the bolsheviks
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  league of the godless formed to persecute christians
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  Stalin takes power in russia
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  priests not considered workers and taxed heavily
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  Law on Religious associations passed
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  the pope condemns communism and calls it an evil empire, declaring that, "an iron curtain has descended across the continent"
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  only 500 churches remain in russia