Kupriyanov served in the
Red Army from 1925 to 1927. He also briefly served in the
Soviet Army from 1939 to 1940 during the
Winter War. With the outbreak of
World War II, Kupriyanov joined the Military Council of the
7th Army on June 30, 1941. He also became a member of the Military Council of the
Karelian Front on August 23, 1941. He was awarded the rank of Division commander on October 1, 1942. Not to long after, Kupriyanov was awarded the rank of
Major general. After the liberation of the
Karelo-Finnish Soviet Socialist Republic in 1944, a few members of the command of the
Karelian Front (including General
Terenty Shytkov) proposed to deport the indigenous population of the
Karelo-Finnish SSR to
Siberia and the
Kazakh SSR and liquidate the republic. However the mass deportation of the
Karelo-Finnish did not happen. Some historians credit Kupriyanov for preventing the mass deportation. He joined the
All-Union Communist Party (Bolsheviks) in 1926, but worked as a social science teacher at
Solgalich Secondary School from 1927 to 1929. He became the Head of the Department of Public Education of the
Solgalich District Executive Committee in 1929 and remained in the position until 1931. He served as the Head of the Department of Propaganda and Agitation of the Solgalich District Committee of the Communist Party from 1931 to 1932. After returning from university in 1935, Kupriyanov served as the Head of the School Department of the
Dzerzhinsky District Committee of the Communist Party. He served as the First Secretary of the
Kuybyshevsky District Committee of the Communist Party of the Soviet Union from 1937 to 1938 in
Leningrad. As a regional committee's First Secretary, Kupriyanov became part of the
NKVD troika in September 1938. He commenced a brutal purge to remove Finnish and Karelian personnel that saw at least 9,100 Finns sentenced to death, with estimates of the total death toll ranging as high as 30,000 or even 40,000 people. During the Winter War, he ordered the construction of the 132 kilometer-long
Petrozavodsk-
Shuezersk railway; the railway was built in 46 days. With the formation of the
Karelo-Finnish SSR in 1940, he became the First Secretary of the
Communist Party of the Karelo-Finnish Soviet Socialist Republic on April 2, 1940. He was elected as a candidate member of the Central Committee of the All-Union Communist Party (Bolsheviks) during the
18th Party Congress. Gennady Kupriyanov and his family were evacuated to
Novosibirsk in August 1941 due to
World War II. He was removed from his post on January 25, 1950, due to the
Leningrad Affair. == Leningrad Affair ==