Presaged by the Group Theaters 1939 production of Golden Boy, postWorld War II boxing films like Body and Soul, Champion, and The Set-Up were all about class struggle, specifically the brutality of the capitalist system and the pathos of the proletariat; with few exceptions, Hollywood boxers were tragic figures until Sylvester Stallone changed the game, upping the genres ethnic ante and opting for a Cinderella structure, to create one of the greatest success sagas in American movies.
That's because we've already seen many of the boxing movies – from "The Set-Up" and "Somebody Up There Likes Me" to "Rocky" and "Raging Bull" – that "The Fighter" draws on.