purges

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+-Effective way of mobilizing the population behind the government and intimidating opponents
 
+-The public trial as a political tool
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+-Purging the party of old Bolshevik leaders, 1936-1938
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+-Purging the cultural and military elites
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+-681,692 purges in 1937-1938
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+-1.3 million in the labor camp system (Gulag)