looks like it's not only the UK that has problems with this film:
https://uk.yahoo.com/movies/guillerm...628674276.html - Guillermo Del Toro Slams Warner Bros. For Censoring Ken Russell's The Devils
"Guillermo del Toro has slammed Warner Bros. for blocking the home entertainment release of Ken Russell’s controversial 1971 religious drama The Devils in North America.
The Devils, which has yet to be released on DVD or Blu-ray in North America, has Oliver Reed playing a vain priest who faces a witch hunt when a mad nun, played by Vanessa Redgrave, accuses him of being a sorcerer."