23 oct. 1926 - the joint plenum of the Central Committee and the Central Control Commission of the All-Union Communist Party of Bolsheviks removed L. D. Trotsky from the Politburo of the Central Committee of the All-Union Communist Party of Bolsheviks and relieved L. B. Kamenev of his duties as a candidate member of the Politburo of the Central Committee of the All-Union Communist Party of Bolsheviks