About a type of cult - not religious. Just a movie. However, about had several earmarks of a cult. Mind control, falsely making friendship for gaining sex slaves, willing to kill, even slaves willing to kill, false fronts.
Many, after one finely discovers a cult, one can spot others, of any kind, more easily.
Most people I know loved that movie. I didn't. I'm just sick and tired of that racial shit that's going on in USA. Why on Earth do I want to watch more of that crap and pay for it.
I wouldn't say it has a parallel with a cult at all. Unlike in a cult, the black people in the movie were not brainwash by persuasion; they were surgically altered to serve white people. That's not exactly how things happen in a cult.