In the original Star Trek series, in the episode “Plato’s Stepchildren,” the kiss between Kirk and Uhura was one of the first—if not the first—interracial kiss on American television. It received considerable attention when it originally aired. However, it didn’t received the most warm reception back then.
IMDB (Internet Movie Database) states that the network executives “ordered the director to shoot a take where [Kirk] and Uhura did not kiss, just so it would be available,” but William Shatner ensured that the footage they took (without the kiss, that is) wasn’t viable. However, stations, particularly in the South (of the U.S.), “refused to air the episode” (click here).
The fact that they weren’t compliant to airing the episode simply because of the interracial kiss, simply because Kirk (William Shatner) was white and Uhura (Nichelle Nichols) was black, is definitely discrimination.
(This video, published on January 29, 2013, was posted by Discovery TV; it is used strictly for educational purposes.)
The video above even specifies that it was “unheard of” for an African-American to play a main role.
I don’t know how it would’ve been like if they hadn’t aired this episode, or at least that kiss, but today, there have been more interracial relationships developing on-screen, notably in Grey’s Anatomy, one of the most diverse shows I’ve watched (click here).