If there's anything the moral arbiters responsible for banning the Video Nasties feared and loathed, it was movies about cannibals. Movies that actually had the word "cannibal" in their titles may as well have painted juicy targets on their backs.
In 1980s Britain, certain grindhouse flicks could not be shown in theaters without extensive cuts due to extreme violence. There were 72 videos -- the worst of the worst -- that were, for all intents and purposes, banned in the UK. Later, they were released uncut on home video, where BBFC certification wasn't necessary. These were the “video nasties.”