Sugar Hill(1974)

When her boyfriend is brutally murdered, after refusing to be shaken down by the local gangsters running their protection racket, Sugar Hill, decides not to get mad, but BAD! Calling upon the help of aged voodoo queen Mama Maitresse, Sugar entreats her to call upon Baron Zamedi, the Lord of the Dead, for help in gaining a gruesome revenge. In exchange for her soul, the Dark Master raises up a zombie army to do her bidding. The bad guys who thought they were getting away clean are about to find out that they're DEAD wrong.