What Star Trek episodes (any series) have been censored?

Outside of the UK, the DS9 episode Rejoined and TOS episode Plato's Stepchildren were both censored in several markets due to homosexual and interracial kissing, respectively. There were also instances in TOS where Roddenberry was forced by Paramount to drop, add, or change certain lines of dialogue, notably the episode Who Mourns for Adonais?, in which one of Kirk's lines was altered from (this is from memory, so I may be off slightly) "Humanity no longer needs gods!" to the more middle-America-friendly "Humanity no longer needs gods! It does fine with just the one!"

Outside of the major coastal networks in the US, various local affiliates would censor, cut from and (rarely) add to existing episodes as their whims dictated, to the point where for everyone outside of California and the American East Coast could only see full episodes at sci-fi conventions.

I am unaware, however, of any government censorship of Star Trek outside of the previously noted British examples. I am certain, however, that certain unsavoury regimes have doubtless censored Star Trek, much as they've censored other television programs in the past.