List three occasions when the soviet union put down revolts in eastern europe during the cold war

The uprising of East Germany in 1953;

More than 50,000 employees demonstrated in soviet however, the army attacked them and ended the protest

The revolution of the Hungarian in 1956;

When Imre Nagy took over power, he tried to introduce new reforms however the red army crushed his changes, and because of this he was executed

1908 Prague spring;

Alexander Dubcek introduced it after he had gained power and brought he democratic reforms; however, the soviet sent troop that ended his democratic reforms.