For 10 points, name this exiled Communist who was killed with an ice-pick in Mexico.
An "American Committee of Defense" for this man was headed by the philosopher John Dewey.  While in prison, he formulated the concept of "permanent revolution" which stated that socialist revolutions in other countries would follow the one in his own nation. This one-time chairman of the Petrograd Soviet founded the Fourth International and wrote The Revolution Betrayed in 1937. This man was offered sanctuary by Lazaro Cardenas, but was assassinated by Ramon Mercador. For 10 points, name this exiled Communist who was killed with an ice-pick in Mexico.
An "American Committee of Defense" for this man was headed by the philosopher John Dewey.  
Leon Trotsky [or Lev Trotsky or Lev Davidovich Bronstein]