Oscar Blum
Oscar Blum was a Lithuanian–French chess master.
He was pushed off Lenin's 1917 train by Lenin himself This incident is mentioned in Ben Kingsley's Lenin movie, and in James Wollrab: Russian Winter p. 206
In 1923 his book Russiche Köpfe was published in Germany. He described Grigory Zinoviev as a dreamer, a sleepwalker, who lived in a world of pure literature.