"The Maltese Falcon" was released in 1941, with a bigger budget and bigger stars than many of the B-movie noirs to follow. It's a template for the genre, with Humphrey Bogart as the hard-bitten but morally compromised hero, Mary Astor as the femme fatale, Sydney Greenstreet and Peter Lorre as slimy villains, and Elisha Cook, Jr., as the gun-toting enforcer.
Richard Widmark in Harry Fabian's "Night and the City." 1950. A small-time grifter and nightclub tout takes advantage of some fortuitous circumstances and tries to become a big-time player as a wrestling promoter. Found the Golden Reel on a porch across from MacArthur Park in LA Noire