Black Beauty was banned in South Africa because it used the words "black" and "beauty" in the title. Of course, there aren't even any black people in the book, since it is set in 19th century England. During apartheid, the censor in South Africa assumed the book was some kind of black rights novel. He did not even read it.
The book is actually about animal rights and Black Beauty is a horse. It was written in 1877 by Anna Sewell.