Howard Koch

Co-wrote the screenplay for Casablanca (1942), sharing the Academy Award for a script now credited with some of American film's most quoted lines. Five years later he was named one of the "Hollywood Nineteen" targeted by the House Un-American Activities Committee, and after refusing to cooperate he was blacklisted; he moved to England and kept writing under a pseudonym before eventually returning to the United States and resuming screenwriting under his own name.