What was the movie called with the black men and they where fighting pit bulls?

The movie you're referring to is likely "Undisputed" (2002), which features a storyline involving prison boxing and characters who face off in brutal fights. However, if you are specifically thinking about a film that focuses on pit bulls and fighting, you might be thinking of "The Dog Fighter" (2015), which explores the underground dog fighting scene. If neither of these matches your description, please provide more details for clarification.