We read:
"Two weeks ago, Hayes, a longtime Scientologist, announced he was quitting "South Park," the animated show that transformed the "Shaft" star into "Chef" and introduced him to a new legion of fans. He said the show had exceeded the boundaries of good taste when it aired an episode titled "Trapped in the Closet" -- in November -- that skewers Scientology and Cruise. "South Park" creators Matt Stone and Trey Parker responded to Hayes by saying something to the effect of, "Dude, you're just noticing that we offend people now?" But last week, a rerun of that Scientology episode was mysteriously pulled off the air amid published reports that Cruise had used his clout to bury it. A Cruise spokesman denied that."
Source
Sure, a private company is entitled to air its shows or not as it likes but censorship does not have to be by governments to be destructive and limiting. There is counter-pressure on the company to re-air the show and one can only hope it succeeds.
Andrew Sullivan makes an eloquent case for why we need South Park and ALL its episodes, despite the unpleasant aspects of the show. Sullivan blames "religion" for the ban but Hollywood (with its love of all weirdness, including Scientology) is the more likely culprit.