Slaughter(1972)

A former member of the United States Special Forces named Slaughter (Jim Brown), after his parents were killed in a bombing incident, begins his investigation on this issue and finds out that the bombing was the work of the mafia. He decides to take revenge on his own and manages to kill several of the criminals who were responsible for the incident, but now the police have arrested Slaughter and he has been charged with murder. He makes a contract with the government to find and kill the rest of the criminals in exchange for the removal of his charges...