| 10 Oct 1917 |
Bubnov, Zinoviev, Kamenev, Lenin, Sokolnikov, Stalin and Trotsky elected members of the Political Bureau at the Central Committee meeting |
| Oct 1917 |
Political bureau ceased to function after the success of the Bolshevik coup in Petrograd (October 25 [November 7], 1917) |
| 25 Mar 1919 |
Kamenev, Krestinskii, Lenin, Stalin and Trotsky elected full members at the Central Committee plenum; Bukharin, Zinoviev and Kalinin elected candidate members |
| Jul - Sep 1919 |
According to an agreement between the Politbiuro and the Orgbiuro, chief secretary of the Central Committee Stasova temporarily joined the Politbiuro in July to Sept 1919 |
| 5 Apr 1920 |
Kamenev, Krestinskii, Lenin, Stalin and Trotsky elected full members at the Central Committee plenum; Bukharin, Zinoviev and Kalinin elected candidate members |
| 16 Mar 1921 |
Zinoviev, Kamenev, Lenin, Stalin and Trotsky elected full members at the Central Committee plenum; Bukharin, Kalinin and Molotov elected candidate members |
| 3 Apr 1922 |
Zinoviev, Kamenev, Lenin, Rykov, Stalin, Tomskii and Trotsky elected full members at the Central Committee plenum; Bukharin, Kalinin and Molotov elected candidate members |
| 26 Apr 1923 |
Zinoviev, Kamenev, Lenin, Rykov, Stalin, Tomskii and Trotsky elected full members at the Central Committee plenum; Bukharin, Kalinin, Molotov and Rudzutak elected candidate members |
| 21 Jan 1924 |
Lenin died |
| 2 Jun 1924 |
Bukharin, Zinoviev, Kamenev, Rykov, Stalin, Tomskii and Trotsky elected full members at the Central Committee plenum; Dzerzhinskii, Kalinin, Molotov, Rudzutak, Sokolnikov and Frunze elected candidate members |
| 31 Oct 1925 |
Frunze died |
| 1 Jan 1926 |
Bukharin, Voroshilov, Zinoviev, Kalinin, Molotov, Rykov, Stalin, Tomskii and Trotsky elected full members at the Central Committee plenum; Dzerzhinskii, Kamenev, Petrovskii, Rudzutak and Uglanov elected candidate members |
| 20 Jul 1926 |
Dzerzhinskii died |
| 23 Jul 1926 |
Zinoviev relieved of duties at the Central Committee plenum; Rudzutak elected full member; candidate members re-elected as follows: Andreev, Kaganovich, Kamenev, Kirov, Mikoian, Ordzhonikidze, Petrovskii, Uglanov |
| 23 Oct 1926 |
Trotsky and Kamenev relieved of duties at the joint plenum of the Central Committee and the Central Control Commission |
| 3 Nov 1926 |
Ordzhonikidze relieved of duties at the joint plenum of the Central Committee and the Central Control Commission; Chubar elected candidate member |
| 19 Dec 1927 |
Bukharin, Voroshilov, Kalinin, Kuibyshev, Molotov, Rykov, Rudzutak, Stalin and Tomskii elected full members at the Central Committee plenum; Andreev, Kaganovich, Kirov, Kossior, Mikoian, Petrovskii, Uglanov and Chubar elected candidate members |
| 29 Apr 1929 |
Uglanov relieved of duties at the Central Committee plenum; Bauman elected candidate member |
| 21 Jun 1929 |
Syrtsov elected candidate member at the Central Committee plenum |
| 17 Nov 1929 |
Bukharin relieved of duties at the Central Committee plenum |
| 13 Jul 1930 |
Voroshilov, Kaganovich, Kalinin, Kirov, Kossior, Kuibyshev, Molotov, Rudzutak, Rykov and Stalin elected full members at the Central Committee plenum; Andreev, Mikoian, Petrovskii, Saratov and Chubar elected candidate members |
| 1 Dec 1930 |
Saratov relieved of duties by questionnaire at the Central Committee plenum |
| 21 Dec 1930 |
Rykov and Andreev relieved of duties at the joint plenum of the Central Committee and the Central Control Commission; Ordzhonikidze elected full member |
| 4 Feb 1932 |
Rudzutak relieved of duties at the Central Committee plenum; Andreev elected full member |
| 10 Feb 1934 |
Andreev, Voroshilov, Kaganovich, Kalinin, Kirov, Kossior, Kuibyshev, Molotov, Ordzhonikidze and Stalin elected full members at the Central Committee plenum; Mikoian, Petrovskii, Postyshev, Rudzutak and Chubar elected candidate members |
| 1 Dec 1934 |
Kirov assassinated |
| 25 Jan 1935 |
Kuibyshev died |
| 1 Feb 1935 |
Mikoian and Chubar elected full members at the Central Committee plenum, Zhdanov and Eikhe elected candidate members |
| 18 Feb 1937 |
Ordzhonikidze committed suicide |
| 26 May 1937 |
Rudzutak expelled from the Central Committee and party by questionnaire (arrested 25 May 1937) |
| 12 Oct 1937 |
Ezhov elected candidate member at the Central Committee plenum |
| 14 Jan 1938 |
Postyshev relieved of duties at the Central Committee plenum; Khrushchev elected candidate member |
| 29 Apr 1938 |
Eikhe arrested |
| 3 May 1938 |
Kossior arrested (executed 26 Feb 1939) |
| 16 Jun 1938 |
Chubar relieved of duties by the Politbiuro decision |
| 22 Mar 1939 |
Andreev, Voroshilov, Zhdanov, Kaganovich, Kalinin, Mikoian, Molotov, Stalin and Khrushchev elected full members at the Central Committee plenum; Beria and Shvernik elected candidate members |
| 21 Feb 1941 |
Voznesenskii, Malenkov and Shcherbakov elected candidate members at the Central Committee plenum |
| 10 May 1945 |
Shcherbakov died |
| 18 Mar 1946 |
Beria and Malenkov elected full members, Bulganin and Kosygin candidate members at the Central Committee plenum |
| 3 Jun 1946 |
Kalinin died |
| 26 Feb 1947 |
Voznesenskii elected full member at the Central Committee plenum |
| 18 Feb 1948 |
Bulganin approved full member by questionnaire |
| 31 Aug 1948 |
Zhdanov died |
| 4 Sep 1948 |
Kosygin approved full member by questionnaire |
| 7 Mar 1949 |
Voznesenskii relieved of duties by questionnaire |
