For 10 points, name this
 Bolshevik leader who was exiled by Stalin.
This man's downfall came after he was too proud to share a dying declaration made in his favor. In
 1925, this man was appointed to two technical posts as well as to the Concessions Committee. Two years
 earlier, he sent a letter which prefigured the Declaration of 46, which was also sent to the Politburo,
 consolidating his position as the de facto leader of the Left Opposition. This man's theory of "permanent
 revolution" was opposed to the idea of "socialism in one country." This commander of the Red Army was
 killed by Ramón Mercader, who assassinated him with an ice axe in Mexico. For 10 points, name this
 Bolshevik leader who was exiled by Stalin.
This man's downfall came after he was too proud to share a dying declaration made in his favor.
Leon {Trotsky} [or Lev Davidovich {Bronshtein}]