Film noir
Film noir is often said to be defined by "moral ambiguity", yet the Production Code obliged almost all classic noirs to see that steadfast virtue was ultimately rewarded and vice, in the absence of shame and redemption, severely punished (however dramatically incredible the final rendering of mandatory justice might be). A substantial number of latter-day noirs flout such conventions: vice emerges triumphant in films as varied as the grim "Chinatown" and the ribald "Hot Spot".