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Many regions in Russia were affected by the Soviet famine of 1932–1933: Volga; Central Black Soil Region; North Caucasus; the Urals; the Crimea; part of Western Siberia; and the Kazak ASSR. With the adoption of the 1936 Soviet Constitution on December 5, 1936, the size of the RSFSR was significantly reduced. The Kazakh ASSR and Kirghiz ASSR were transformed into the Kazakh and Kirghiz Soviet Socialist Republics. The Karakalpak Autonomous Socialist Soviet Republic was transferred to the Uzbek SSR.

What document was ratified on December 5, 1936?
the 1936 Soviet Constitution