Horror movies have long been the victim of censorship, but some movies were absolutely hacked apart before they were released to the public. Before the establishment of the Hays Code in the middle of the 1930s, film was a largely unrestrained medium. However, as the Hollywood system solidified, so too did strict censorship rules.
With its sex, violence, and overt terror, the horror genre has vexed censors for generations. Along the way, it has pushed the boundaries of acceptable taste and dragged prudes kicking and screaming into the future. Nevertheless, bodies like the MPAA have been slapping X and NC-17 ratings on horror films that they deem inappropriate to be shown in theaters.
Filmmakers have been forced to make massive cuts to their movies to achieve a theatrical release. This

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