The Central Committee (CC) composition was elected by the 16th Congress, and sat from 13 July 1930 until 10 February 1934. Its 1st Plenary Session renewed the composition of the Politburo, Secretariat and the Orgburo of the All-Union Communist Party (Bolsheviks). The 16th Congress was the first party convention since the 13th Congress which saw no organized opposition, and the first congress in party history in which there was no opposition to the party leadership. Ukrainian historian Oleg Khlevniuk considers the period 1930–1934 to be a "transitional period" between collective leadership (referred to interchangeably by him as oligarchy) and Joseph Stalin's personal dictatorship (autocracy). The removal of Alexei Rykov, the Chairman of the Council of People's Commissars (SNK, the Soviet government), from the Politburo at the 1st Joint Plenary Session of the CC and the Central Control Commission (CCC) has been marked in historic literature as "the definitive Stalinization of that body [Politburo]" according to Khlevniuk.