Khrushchev
Akbal Ikramov of the March 1938 "Bukharin" Trial, was not officially "rehabilitated" until May 1957, after the 20th Party Congress, Khrushchev did deplore the executions of Zinoviev, Kamenev, and Trotskyites in the Secret Speech. This constituted at least an
period from the early 1950s to the early 1960s when repression and censorship in the Soviet Union were relaxed