Flag_of_the_Soviet_Union_(1923).png (original file) (600 × 300 pixels, file size: 5 KB, MIME type: image/png)
This is the flag of the Soviet Union from 1923 to 1955. As such, it was the Soviet Union's official flag throughout the 1930s.
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The Union of Soviet Socialist Republics (USSR), also known as the Soviet Union, was a...