Mr. Mean (1977)

Starring:

• Fred Williamson 
• Lou Castel 
• Raimund Harmstorf

Storyline
Fred Williamson stars as Mr. Mean, a hit man in a league by himself. His latest assignment - terminate without prejudice, a notorious mafioso don who has embarrassed his 'Family.' Mr. Mean performs his task with ease. But much to his surprise, Mr. Mean is next on the mafia's hit list. after all, dead men tell no tales, but some men are just too mean to die! 

Link to soundtrack review.
Mr. Mean (1977) - The Ohio Players