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Organising the Soviet government: 1917–1918

The Provisional Government had planned for a Constituent Assembly to be elected in November 1917; despite Lenin's objections, Sovnarkom allowed the vote as scheduled. In the election, the Bolsheviks gained about a quarter of the vote, losing to the agrarian-focused Socialist-Revolutionaries. Lenin argued that the election did not reflect the people's will, claiming the electorate was unaware of the Bolsheviks' programme, and that candidacy lists were outdated, having been drawn up before the Left Socialist-Revolutionaries split from the Socialist-Revolutionaries. Nevertheless, the newly elected Russian Constituent Assembly convened in Petrograd in January 1918. Sovnarkom claimed it was counter-revolutionary because it sought to remove power from the soviets, but the Socialist-Revolutionaries and Mensheviks denied this. The Bolsheviks presented a motion to strip the Assembly of most of its legal powers; when the Assembly rejected this, Sovnarkom declared it counter-revolutionary and forcibly disbanded it.

Lenin rejected repeated calls, including from some Bolsheviks, to establish a coalition government with other socialist parties. Though Sovnarkom refused a coalition with the Mensheviks or Socialist-Revolutionaries, it allowed the Left Socialist-Revolutionaries five cabinet posts in December 1917. This coalition lasted only until March 1918, when the Left Socialist-Revolutionaries left the government over disagreements about the Bolsheviks' approach to ending the First World War. At their 7th Congress in March 1918, the Bolsheviks changed their name from the Russian Social Democratic Labour Party to the Russian Communist Party, as Lenin wanted to distance his group from the increasingly reformist German Social Democratic Party and emphasize its goal of a communist society.

Although ultimate power officially rested with Sovnarkom and the Executive Committee (VTSIK) elected by the All-Russian Congress of Soviets (ARCS), the Communist Party was de facto in control in Russia, as acknowledged by its members at the time. By 1918, Sovnarkom began acting unilaterally, citing a need for expediency, with the ARCS and VTSIK becoming increasingly marginalized, so the soviets no longer had a role in governing Russia. During 1918 and 1919, the government expelled Mensheviks and Socialist-Revolutionaries from the soviets. Russia had become a one-party state.

Within the party, a Political Bureau (Politburo) and Organisation Bureau (Orgburo) were established to accompany the existing Central Committee; decisions of these bodies had to be adopted by Sovnarkom and the Council of Labour and Defence. Lenin was the most significant figure in this governance structure, being Chairman of Sovnarkom and sitting on the Council of Labour and Defence, the Central Committee, and the Politburo. The only individual with comparable influence was Lenin's right-hand man, Yakov Sverdlov, who died in March 1919 during a flu pandemic. In November 1917, Lenin and his wife took a two-room flat within the Smolny Institute; the following month, they went on a brief holiday in Halila, Finland. In January 1918, he survived an assassination attempt in Petrograd; Fritz Platten, who was with Lenin at the time, shielded him and was injured by a bullet.

Concerned by Petrograd's vulnerability to German attack, Sovnarkom began relocating to Moscow in March 1918. Lenin, Trotsky, and other Bolshevik leaders moved into the Kremlin. He survived another assassination attempt in August 1918.