1. The Soviet Union invaded Czechoslovakia and reversed its economic reforms. (1968)
2. Workers in Poland won higher wages after an uprising. (1956)
3. Yugoslavia parted ways with the Soviet Union because of political differences. (1948)
4. Military forces began constructing the Berlin Wall. (1961)
The invasion of the Soviet Union through 200,000 troops was done in Czechoslovakia for the purpose of making economic reform that is making liberalization and removing communism.
Poland workers demanded better working conditions along with improved wage pay rates. Thus, it made laborers strike in order to get their demands fulfilled and get the freedom to form trade unions.
Yugoslavia being a communist state moved out of the Soviet Union to get a decentralized and less repressive government.
The Wall of Berlin was constructed in order to symbolize the cold war. Thus, it tends to restrict the movement of its population from East Berlin to West Berlin as East Berlin was Soviet-controlled.
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