I’d have to say, a movie called The Savage Messiah, centering around Roch Thériault, who was a French Canadian cultist, and for years, abused his followers. This happened in the eighties in Québec, and later Ontario. He lived in the woods with his followers, manipulating and mistreating them. He said he was the reincarnation of Moses, and was readying his people, an odd 20 or so, mostly women and children, for the Apocalypse. He aimed to build a new world and was preparing his people for it by teaching them how to survive, and how to properly love one another, as according to God. But, mostly what he did was get drunk and unleash unspeakable horrors on his followers. He beat and raped them, both the women and the children, didn’t give them enough to eat, and two people died, although those were the ones who’s deaths were confirmed.
(later in prison, ’‘Mosses’’ admitted to not believing in God, and was saying that to more easily control his people, who were all fairly religious)
Now the movie is kind of cheesy, but I’ve read a whole lot about this guy and what went on in his cult, and it seems to have been quite faithful to the actual events. The took all the important elements and tried to make them follow one another, they mentioned every nasty detail and showed as much as humanly possible for a TV movie. (this was never in theaters, as far as I know)
The movie really isn’t graphic at all, and they added their own story so that it wouldn’t just be a tasteless chain of nasty scenes, but even that is supposed to reflect, more or less, how this guy was finally brought to justice. A lot of what I read was not included in the movie, (like sawing off the top of a woman’s skull and masturbating in the cavity) but with what I have read, they really got as close as legally possible lol, and the timeline and events seem to have all been well respected. Makes for a ghastly movie.
Some of the inaccuracies involve a lot of the decor. In the movie, the small community’s wooden buildings out in the woods are a lot nicer and homey looking that what it looked like in real life.