Political transformation under Stalin

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Across
  1. 4. a 'bloc' the accused supposedly belonged to
  2. 6. Public 'Trial' with predetermined outcome
  3. 8. Administrators who controlled Party function
  4. 9. _______ ravens,
  5. 10. His murder was a pretext for Stalin's purge
  6. 11. To repudiate someone; blacken reputation
  7. 13. Political supervisors of production levels
  8. 14. Peoples Commissariat for Internal Affairs
  9. 16. Kirov was the Party Leader in this city
  10. 18. Soviet labour camp for arrested 'enemies'
  11. 19. Moscow show trial of Yagoda (head of NKVD)
  12. 21. 'Wealthy' peasants targeted by terror
  13. 22. Large enlistment for a specific purpose
  14. 23. Stalinist history of the CPSU. _____ Course
Down
  1. 1. A preset number of required arrests
  2. 2. Supporters of external enemies; ____ Column
  3. 3. Terror operation against ethnic groups
  4. 5. 17th Party Congress; 'The Congress of _____'
  5. 7. The Great _______
  6. 8. Replaced Yezhov as head of the NKVD in 1938
  7. 9. Stalin's favoured colour pencil
  8. 12. Those arrested were declared _______
  9. 15. Former name of the NKVD
  10. 17. Army commander; start of Red Army purge
  11. 20. Party Congress in 1934; beginning of purges