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Dial Red O is a 1955 American film noir crime film directed by Daniel B. Ullman and starring Bill Elliott, Helene Stanley and Keith Larsen. It was the first in a series of five Los Angeles-set police thrillers that Elliott made for Allied Artists at the end of his career. The letter "O" in the title actually represents a zero, since it is supposed to be the number on a phone dial. imdb.com