In the 1950s, the Comics Code Authority slammed EC Comics (publisher of Mad, Tales From The Crypt, and Weird Science, among others) for a comic story that ended with the revelation that an astronaut was black.
Censorship boards (whethere they are "industry" self-regulation or government imposed) have the power to condemn works they disagree with on whatever grounds.
Thanks, that's pretty interesting. Look how far we have come.