How secure was the USSR's control over Eastern Europe from 1948-1989?

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Across
  1. 2. Leader of Czechoslovakia who promised reforms in 1968
  2. 4. Where did the Polish workers who went on a strike in 1980 work at?
  3. 6. Number of demands made by Polish strikers (write out number)
  4. 7. Line dividing Soviet controlled East and capitalist West
  5. 11. Where did the troops that were sent into Czechoslovakia come from?
  6. 13. What did the mass migration of East Berliners to West Berlin serve as for the USSR? (p_____)
  7. 14. Number of tanks sent into Hungary on 4th November 1956
  8. 15. Name given to the culture of reform in Czechoslovakia
  9. 16. Term used to describe how the more intelligent were emigrating from East Germany
  10. 18. A set of rules with three main principles created by a USSR leader
  11. 19. Who benefited more from the building of the Berlin Wall? (USSR or West)
  12. 20. What is the main reason for the mass migration from East Germany to West Germany
Down
  1. 1. Name of Polish independent trade union created in 1980
  2. 3. Similar cause of Hungarian uprising and Czechoslovakian uprising
  3. 5. Event that made Czechoslovakians want to stage an uprising against USSR
  4. 8. Hungarian leader who made a false promise with Nagy and his followers
  5. 9. Crisis the Polish government was facing in 1980
  6. 10. Event that inspired the Hungarians to stage an uprising against USSR
  7. 12. The Polish strikers were angry at the recently announced ________?
  8. 17. The reaction of the wider world towards the uprisings were (positive or negative)