For 10 points, name this Marxist revolutionary and founder of the Fourth International who led a failed struggle against Stalin's rise in the 1920s.
After this figure's position of "no war, no peace" wasn't accepted in the debate over a treaty, he resigned in favor of Georgy Chicherin. He denounced Zinovyev and Kamenev's opposition to the October Revolution in The Lessons of October 1917, but later joined with them. This man ordered the suppression of the Kronstadt Rebellion and was the head of the Red Army during the Revolution. He rejected a rival's theory of "socialism in one country" in favor of international "permanent revolution", and was soon removed from the Politburo and Central Committee. He was fatally attacked by Ramón Mercader with an ice pick in Mexico City, where he ended up after being exiled due to a split with Stalin. For 10 points, name this Marxist revolutionary and founder of the Fourth International who led a failed struggle against Stalin's rise in the 1920s.
After this figure's position of "no war, no peace" wasn't accepted in the debate over a treaty, he resigned in favor of Georgy Chicherin.
Leon Trotsky [or Lev Davidovich Bronshtein]