In October 1927, soon after catastrophic events regarding the Chinese Revolution of 1925-27, which confirmed the United Opposition's critical analysis of the Communist Party's support for the nationalist Kuomintang, the last United Opposition members were expelled from the Communist Party Central Committee; and in November 1927, Trotsky and Zinoviev were expelled from the Communist Party itself. In December 1927, the XVth Party Congress declared Left Opposition and Trotskyist views to be incompatible with Communist Party membership and expelled all leading Left Opposition supporters from the Party.