Chubar was from an ethnic
Ukrainian peasant family. He was born in
Fedorіvka,
Yekaterinoslav Governorate,
Russian Empire (now in
Polohy Raion,
Zaporizhzhia Oblast,
Ukraine). His parents were illiterate peasants who owned a small plot of land. He was arrested and beaten by gendarmes for belonging to a revolutionary group when he was 13 years old. After leaving school, he worked as a roofer. Chubar became a
Marxist revolutionary during the
1905 revolution and joined the
Bolshevik faction of the
Russian Social Democratic Labor Party in 1907. He was a senior figure in
Vesenkha in Moscow, and the Urals, in 1918–20. Chubar returned to Ukraine in 1920, where he held a succession of economic posts, including running the Don basin coal combine in 1922–23. He was a member of the Central Committee of the
Communist Party of Ukraine in 1920–36, and of its Politburo. In 1922, Chubar was elected a member of the
Central Committee of the Soviet Communist Party. On July 13, 1923, Chubar replaced
Christian Rakovsky as Chairman of the Ukrainian
Sovnarkom. The government headed by Vlas Chubar was approved by the
Eighth (1924) and the
Tenth (1927)
All-Ukrainian congresses of Soviets. In the early 1920s, Chubar tried to resist allowing Ukraine to be controlled from Moscow. In 1920, he objected to the appointment of a Russian,
Vyacheslav Molotov, as secretary of the Ukrainian communist party, claiming that he knew very little about conditions in Ukraine. When their relations reached the breaking point in 1928 Stalin recalled Kaganovich, whose replacement,
Stanisław Kosior, was much more acceptable to Chubar and other Ukrainian leaders. Chubar became a candidate (non-voting) member of the
Central Committee's Politburo in November 1926 – the first, and for many years the only ethnic Ukrainian to reach this level. He supported Stalin in the struggle against
Leon Trotsky in the 1920s and made an "ugly speech" attacking Trotsky and others at the Central Committee session in October 1927 which resolved to expel them from the communist party. ==Holodomor==