I first saw this in 1975 at the Strand theater on a double bill with SHADOW OF THE HAWK (1975) (which has the qualitys of a made for TV movie) .
Jim Hutton plays a PSYCHO mother obsessed type who goes to prison and learns the powers of voodoo from his black cellmate (I don't make this s**t up).
And he gets revenge with his psychic powers.
What makes this movie so special is the cast. Julie (CREATURE FROM THE BLACK LAGOON) Adams, Aldo Ray, Whit (I WAS A TEENAGE FRANKENSTEIN) Bissel, Neville Brand, Della Reese(!) and actor/director Greydon (DRACULA VS FRANKENSTEIN) Clark!
I got it on vhs back in 1992. LOOK IT UP!