Grigori Zinoviev, Politburo member, Central Committee member, Chief of the Leningrad Party and President of the Communist International. His nickname was Panic. His followers were known as the Anti-Stalinist Zinovievites. He was to be a major link in the chain of events that led to Bukharin's arrest and murder. He was arrested in December 1934, made to play a leading role in the Trial of the Sixteen (the first of Stalin's three infamous trials of old Bolshevik leaders) in August 1936, and was convicted and shot shortly afterwards. Like Bukharin Zinoviev was wrongfully branded as a vrag naroda (enemy of the people). The assassination of Sergei Mironovich Kirov set in motion the chain of events that led to the arrest and murder of Nikolai Bukharin.