The informal term "Soviet Empire" refers to the Soviet Union's influence over a number of smaller nations who were nominally independent but subject to direct military force if they tried to leave the Soviet sphere; see Hungarian Revolution of 1956 and Prague Spring.
Though the Soviet Union was not ruled by an emperor and declared itself anti-imperialist, critics argue that it exhibited tendencies common to historic empires. Some scholars hold that the Soviet Union was a hybrid entity containing elements common to both multinational empires and nation states. It has also been argued that the USSR practiced colonialism as did other imperial powers.
The Soviet Empire consisted of the following:
These countries were the closest allies of the Soviet Union. They were members of the Comecon, a Soviet-led economic community founded in 1949. In addition, the ones located in Eastern Europe were also members of the Warsaw Pact. They were sometimes called the Eastern bloc in English and were widely viewed as Soviet satellite states.