Borderline (1930)

Adah, a black woman, has an affair with Thorne, a white man, much to the dismay of some of the prejudiced townsfolk and Thorne's wife, Astrid. Adah attempts a reconciliation with her man, Pete, but eventually leaves him and the town. Meanwhile, Astrid goes mad and cuts Thorne's face and arm with a knife, but then mysteriously dies. Thorne is tried but acquitted. Because of the events, the mayor sends Pete a letter asking him to leave town for the good of all concerned.