Soviet era (1917–1991) Early Bolshevik period In the Russian Constituent Assembly election held in November 1917—the first and last free election in Kherson for 70 years—Bolsheviks who had seized power in Petrograd and Moscow received just 13.2 percent of the vote in the Governorate. The largest electoral bloc in the district, with 43 percent of the vote, was an alliance of Ukrainian Socialist Revolutionaries (SRs), Russian Socialist Revolutionaries and the United Jewish Socialist Workers Party. The Bolsheviks dissolved SR-dominated Assembly after its first sitting, and proceeded to force from Kiev the Central Council of Ukraine (Tsentralna Rada) whose response to the Leninist coup had been to proclaim the independence of the Ukrainian People's Republic (UPR). But, before the Bolsheviks could secure Kherson, they were obliged to cede the region under the terms of the March 1918 Treaty of Brest-Litovsk to the German and Austrian controlled Ukrainian State. After the withdrawal of German and Austrian forces in November 1918, the efforts of the UPR (the Petluirites) to assert authority were frustrated by a French-led Allied intervention which occupied Kherson in January 1919. In March 1919, the Green Army of local warlord Otaman Nykyfor Hryhoriv ousted the French and Greek garrison and precipitated the Allied evacuation from Odesa. In July, the Bolsheviks defeated Hryhoriv who had called upon the Ukrainian people to rise against the "Communist imposters" and their "Jewish commissars," and had perpetrated pogroms, including in the Kherson region. Kherson itself was occupied by the counter-revolutionary Whites before finally falling to the Bolshevik Red Army in February 1920. In 1922 the city and region was formally incorporated into the Ukrainian SSR a constituent republic of the Soviet Union. The population was radically reduced from 75,000 to 41,000 by the famine of 1921–3, but then rose steadily, reaching 97,200 in 1939. In 1940, the city was one of the sites of executions of Polish officers and intelligentsia committed by the Soviets as part of the Katyn massacre. World War II and post-War period Further devastation and population loss resulted from the German occupation during the Second World War. The German occupation, which lasted from August 1941 to March 1944, contended with both Soviet and Ukrainian nationalist (OUN) underground cells. The Kherson district leadership of the OUN was headed by Bogdan Bandera (brother of OUN leader Stepan Bandera). The Germans operated a Nazi prison and the Stalag 370 prisoner-of-war camp in the city.