The Trial of the Sixteen (1936)
The stars of the first show trial were Zinoviev and Kamenev.
They were charged with organising Kirov's murder, as well as with plotting to overthrow the government and disrupt the 5 year plans.
Both were 'innocent' although pleaded guilty in trial, while in prison.
Both Kamenev and Zinoviev were ordered to be shot by Audrey Vyshinsky.
Kamenev met his death with dignity, Zinoviev took his in despair and panic, begging for his life.
Stalin got his secretary chief to re-enact this for his entertainment.