What happen to eastern european nations occupied by the soviet union after world war II?

After the World War II, the Soviet Union occupied multiple countries in Eastern Europe. The Soviets implemented an ''iron fist'' rule over this countries, and were undertaking extreme measures when necessary in order to keep everything under control, and in the way they liked it. All of this countries became republics in the Soviet Union, and all of then got governments installed by the Soviet Union, governments that were communist and shared the ideology of Stalin.

The Soviet Union collapsed or began to so the nations previously controlled by them could now begin to rebuild their world and recover from the horrific events of the war