What was common in eastern bloc nations?

Communism was common in Eastern Bloc nations.

Explanation:

During Cold War, the Eastern Bloc was the group of communist states of Eastern and Central Europe, especially the Soviet Union and its satellites included in the Warsaw Pact. Prior to 1948, the term included Yugoslavia, but it is generally not included after it broke with Soviet policy following the Tito-Stalin split. Similarly, Albania is not usually included after the Chinese-Soviet split of 1960. The terms Communist Bloc and Soviet Bloc are also used to refer to governments that joined the former Union Soviet, although these terms may include governments within the Soviet Union's sphere of influence outside of Eastern and Central Europe, such as Cuba.

if i am correct the answer is going to be a) the federal program of reconstruction ended.