Although a leader of the Bolshevik Revolution of 1917, the brilliant theorist and orator Leon Trotsky was expelled from the Communist Party in 1927 and then, in 1929, banished from the Soviet Union. His crime? Opposing Stalin. In 1940, Stalin's secret police murdered Trotsky in Mexico. Reviewing a new biography of Trotsky, Hoover fellow Robert Conquest reflects on a man characterized both by ruthlessness and by "the glamor of the Lost Cause."The content of this article is only available in the print edition.