In 1943, he played a retired Norwegian school teacher, Sixtus Andresen, in the Warner Bros. anti-Nazi film, "Edge of Darkness", which starred Errol Flynn and was directed by Lewis Milestone. Carnovsky portrayed George Gershwin's father in "Rhapsody in Blue" in 1945, and in "Dead Reckoning" (1947), he starred as the villainous nightclub owner Martinelli with Humphrey Bogart. In 1950, he portrayed LeBret in "Cyrano de Bergerac" starring José Ferrer. Later that year, he played Dr. Raymond Hartley in the mystery "The Second Woman" and the kindly judge who sentences a young boy who likes to play with firearms in Joseph H. Lewis's "Gun Crazy". This was to be Carnovsky's last Hollywood film for 12 years.