TCM has a great docu-video (see below) where they cover much of his career. "With more than 150 credits to his name, Clarence Muse left behind an extensive and impressive body of work in Hollywood and in independent pictures. He made history with his leading role in the first all-Black talkie, Hearts in Dixie (1929). Nevertheless, being a Black man in Hollywood meant that his talents were relegated to miniscule, often uncredited roles as servants, porters, butlers and chauffeurs."

As far as I know, Clarence Muse was not part of the LGBT family, but he did make Hollywood history by co-writing the screenplay of "Way Down South" with gay poet Langston Hughes. It was a first, two Black male writers getting co-screenplay credit. In 1939!