This is one of the ‘banned cartoons’ (in our modern P.C. age) made by Merrie Melodies in the ‘40s. Stuff like this was uncontroversial and mainstream in 1943. From Wikipedia:
Coal Black and de Sebben Dwarfs (working title: So White and de Sebben Dwarfs) is a Merrie Melodies animated cartoon directed by Bob Clampett, produced by Leon Schlesinger Productions, and released to theatres on January 16, 1943 by Warner Bros. and The Vitaphone Corporation.
The film is an all-black parody of the Brothers Grimm fairy tale Snow White, known to its audience from the popular 1937 Walt Disney animated feature Snow White and the Seven Dwarfs. The stylistic portrayal of the characters is an example of “darky” iconography, which was widely accepted in American society at the time. As such, it is one of the most controversial cartoons in the classic Warner Brothers library, being one of the Censored Eleven. The cartoon has been rarely seen on television, and has never been officially released on home video.