Assertion: imperialism's policy | /r/CapableOf | remain within certain limits
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Source sentences:
text: The nations said to be part of the Soviet Empire in the wider sense were officially independent countries with separate governments that set their own policies, but those policies had to remain within certain limits decided by the Soviet Union and enforced by threat of intervention by the Warsaw Pact (Hungary in 1956, Czechoslovakia in 1968 and Poland in 1980).