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 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 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. Kupriyanov was elected as the First Secretary of the Karelian Regional Committee of the Communist Party in June 1938 on the recommendation of Andrei Zhdanov to Stalin. As a regional committee's First Secretary, Kupriyanov became part of the NKVD troika in September 1938. 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 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
Kupriyanov soon became involved in the Leningrad Affair, he was accused of "failure to fulfill plans in industry and agriculture, patronage of workers who had compromised themselves, clampdown and lack of collegiality in work" by the Central Committee of the Communist Party of the Karelo-Finnish SSR. He was removed from his post as First Secretary of the Communist Party of the Karelo-Finnish SSR on January 25, 1950.
Arrest and Imprisonment
On March 15, 1950, Kupriyanov was arrested and transferred to Moscow. He was imprisoned in Lefortovo Prison two days later. In October 1950, the investigation regarding Kupriyanov was finished and he was sentenced to capital punishment. However, Kupriyanov's execution was postponed due to Stalin's rejection of Malenkov's demand for execution. On January 17, 1952, the Military Collegium of the Supreme Court of the USSR sentenced Kupriyanov to 25 years of forced labor with confiscation of all property under Article 58. He was soon sent to the Intalag, but his sentence was changed in July 1952 to imprisonment. On August 18, his sentence was changed to 10 years of imprisonment without confiscation of property. His wife, Vera Vasilievna was sentenced to imprisonment for "not informing the authorities about her husband's sabotage". Kupriyanov's eldest son and daughter were exiled to Taraz, Kazakh SSR. After the death of Joseph Stalin in the spring of 1953, Kupriyanov's family was allowed to return to Leningrad.
Rehabilitation
Kupriyanov was pardoned on January 18, 1956 by a decision of the Presidium of the Supreme Soviet of the Soviet Union. His criminal record was cleared as well. He was rehabilitated on July 31, 1957 which reinstated his Communist Party membership, his military rank of Major general, and his awards. He was also an assigned a personal pension. He lived in Leningrad until his death in 1979.
