The Web (1947) is in effect a Private Investigator film noir (P.I. Noir) although the character played by Edmond O'Brien is supposed to be a lawyer, although he functions entirely as a P.I,. being hired to be a bodyguard, carrying and using a gun, hanging with his coat collars up in alleyways, and more and more traditional and common P.I. behaviours.
He doesn't get down to none legal work, that is for sure. Other than the top and tail styling back of his maligned blue collar character, played by Tito Vuolo, with typical Vuoloism.