5. "Titicut Follies" (1967)
When a Massachusetts superior court judge blocked its release citing right to privacy issues and tried to have all copies destroyed, pioneer Frederick Wiseman's view of horrific conditions at Bridgewater State Prison for the Criminally Insane became the first film in U.S. history banned from general release for reasons other than obscenity or national security. Some believe it also led to the eventual closing of the institution. What's definite is that 20 years later, in a lawsuit against Bridgewater by the families of several patients who died there, the ban was cited as a contributing factor to their deaths. After years of being shown only to professionals in related fields, Titicut Follies was finally set free by a different judge in 1991.