Movie sites love lists (and admit it, you love them to, whether you agree with them or not). This week Rotten Tomatoes' post on Ban Them All! 10 Infamously Controversial Movies is a must read, not only for at least one odd choice, but for the one science fiction tale that validates the list.
Stanley Kubrick's controversial A Clockwork Orange (1971) was a cautionary tale about society, conformity, and free will wrapped up in ultraviolence, and it was so controversial it was banned from theatrical release in the UK as well as saddled with an X rating on its initial release in the US. It later received an R rating after Kubrick edited out about 30 seconds from two scenes.
A Clockwork Orange is based on Anthony Burgess' 1962 dystopian crime and punishment novel. While the character of Alex DeLarge made Malcolm McDowell a star, and is easily one of the most recognizable film characters of the 20th century, it wasn't because of wide exposure in movie theaters during the initial release.
If you haven't seen the film, it's not just the dystopic society, but the rehabilitation experiment known as the "Ludovico Technique."
Thanks to SciFi Wire for pointing this out.