Page "Grigory Zinoviev" Paragraph 9

In early 1921, when the Communist Party was split into numerous factions and disagreements were threatening to engulf the Party, Zinoviev supported Lenin's faction.

As a result, Zinoviev was made a full member of the Politburo after the Xth Party Congress on March 16, 1921, while members of other factions such as Nikolai Krestinsky were dropped from the Politburo and the Secretariat.