Former Existing Socialism refers to the countries of Actually Existing Socialism that have ceased to exist.
Some are:
Union of Soviet Socialist Republics
Mongolian People's Republic
Socialist Federal Republic of Yugoslavia
People's Socialist Republic of Albania
People's Republic of Bulgaria
Polish People's Republic
Socialist Republic of Romania
Czechoslovak Socialist Republic
German Democratic Republic
Hungarian People's Republic
People's Democratic Republic of Yemen
Republic of Angola
People's Republic of Mozambique
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