Johnny Allegro is a black and white 1949 American film noir, starring George Raft, Nina Foch, Will Geer, and George Macready. An ex-gangster (Raft) working as a federal agent runs afoul of a crime lord (Macready) who enjoys hunting humans for sport. The picture was directed by Ted Tetzlaff and produced by Columbia Pictures.

Based on the paragraph above can we conclude that "Johnny Allegro was of mixed race; black and white."?
It's impossible to say