Fredrik Knudsen did a video on it but TLDR is that a bunch of people lived in a fucked up abusive cult like situation and more or less festered for years back in the early 2000s. It's one of those situations where any shortening past a point doesn't get across how fucking bad it was.

It's not an easily summarized situation. If you really want to dive into the gory details, there's plenty of coverage on the entire thing to be found online.