flag of Union of Soviet Socialist Republics - Encyclopedia Britannica
https://www.britannica.com/topic/flag-of-Union-of-Soviet-Socialist-Republics
WEBHowever, after the victory of Marxist-Leninist forces in Russia, it became more closely identified with communist movements, and social-democratic parties often sought other symbols. On April 14, 1918, the newly formed Russian Socialist Federated Soviet Republic adopted the Red Banner with the initials (or name) of the state in the upper hoist ...
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