The Council for Mutual Economic Assistance (Comecon) was an economic organization that was founded by Soviet Union and the Eastern Bloc countries from 5 to 8 January 1949 at the start of the Cold War. Comecon was the Soviet reaction to the United States' Marshall Plan, and it was meant to prevent Soviet allies from aligning towards the Western Bloc and the USA. The organization focused on common expansion of states, more effective production, and building relationships between its member states, and it was also involved with oil transfers and economic cooperation. On 28 June 1991, at the end of the Cold War, Comecon agreed to dissolve in 90 days, and it was dismantled with the war's end.
- Soviet Union
- People's Republic of Bulgaria
- Czechoslovak Socialist Republic
- Hungarian People's Republic
- Polish People's Republic
- Socialist Republic of Romania