Bronson (2008)

 Action | Biography | Crime 

A young man who was sentenced to 7 years in prison for robbing a post office ends up spending 30 years in solitary confinement. During this time, his own personality is supplanted by his alter ego, Charles Bronson. 

This is the true story of Michael Patterson, a petty crook, that likes to raise hell while incarcerated. He is arrested for stealing and due to his rambunctious nature, he tends to spend a lot of time alone. Upon his release, he takes up bare fisted boxing at the suggestion of a man he met in jail. He needs a fighting name, so he chose Charles Bronson because it is a name people associate with vengeance. (IMDB  Kellie Stewart)