Though now disbanded, what agreement was considered to be the most notable enforced political union of the last 40 years?

Name: Though now disbanded, what agreement was considered to be the most notable enforced political union of the last 40 years?
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COMECON, or the Council for Mutual Economic Assistance, was a notable enforced political and economic union among Eastern Bloc countries during the Cold War, lasting from 1949 until it was disbanded in 1991.

Though Now Disbanded, What Agreement Was Considered to Be the Most