Besides, MANDINGO, and ROOTS, can someone help me to find anyother slavery movies back in the 1970?

I'm looking for some slavery movies the was made in the 1970's or earlier. I have seen bought a movie (VHS), but I don't this VHS, anymore. I can't rememeber the names of those movies. PLEASE DO NOT GIVE ME DRUM, MANDINGO, or, ROOTS. How can I find these movies (I have Netflix, not showing anything old movies of slavery).