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Captain Beatty is the antagonist of the novel, Captain Beatty, runs the fire house where Montag works. The firemens' sole purpose is to sniff out and destroy books and, therefore, destroy the seeds of free thought.
Granger is the leader of the group of hoboes that Montag meets along the tracks after fleeing from the police and Hound. Like Clarisse and Faber, Granger is a sympathetic character, taking Montag under his wing and encouraging him in his quest to remember and comprehend what he has read.