Here are a few more that should be add to the list -

1) Nothing But A Man (Abbie Lincoln)
2) Putney Swope
3) Quilumbo
http://movies.nytimes.com/movie/review?res=9A0DE1DD1039F93BA15750C0A960948260

4) The Last Supper (1976)
http://movies.nytimes.com/movie/review?res=9407E2DF1E3EE432A25756C0A9639C946990D6CF

5) Pinky
6) Buck and the Preacher
7) Do The Right Thing
Imitation of Life (1959)
9) Green Pastures
10) For Love of Ivy
11) Education of Sonny Carson
12) Cornbread, Earl and Me
13) Autobiography of Miss Jane Pittman
14) Glory
15) Malcolm X
16) Song of Freedom (Paul Robeson)
17) The Sophisticated Gents
18) To Sleep With Anger
19) The Spook Who Sat By The Door
20) The Liberation of L. B. Jones