Kiss of Death (1947) is a psychopathic traumatic sttol-pigeon crime procedural film noir, featuring Victor Mature as a troubled ex-con; Brian Donlevy as a firm, fair and forgiving Assistant DA; Richard Widmark as a crazed psychopath; and Collen Gray as a sweet and innocent goody-two-shoes, the type of woman in fact beloved of all film noir scenarios, the guiding angel flying in the fateful face of sexual lust and loose living.
An all-American woman perhaps, certainly offering morality and everything else in line with the cinematic Code of operation.
The semiotic valuations which lead to the promotion of one family ideal, and the extinction of African American life in the process, was a bold attempt by Hollywood to attempt to mythify the American way of life into a set of values that all would adopt.
While similarly in this case being spooked up to high heaven by the emerging figure of the psychopath. And that with one of the greatest psychopath's in film history. Noir is its own set of cultures and ideas, and is roughly speaking, a set of conventions defining perception in limited and predictable ways within just about any picture of American life you might care to inject it into.