21st Jan 1924 - Death of Lenin
1923-25 - Triumvirate - Stalin, Kamenev and Zinoviev
1925-26 - New Opposition of Kamenev and Zinoviev formed against the Duumvirate of Stalin and Bukharin.
1926-27 - United Opposition of Kamenev, Zinoviev and Trotsky against the Duumvirate of Stalin and Bukharin
1927 - Trotsky sent to exile
1927-28 - Grain procurement crisis
1928 - Stalin defeats Bukharin
1928 - First Five-Year Plans begins