There is an HBO documentary (also on Crave) out now called 'The Vow' which goes over this and is pretty interesting (mostly because they filmed everything they did, basically, so there's a crazy amount of footage giving a pretty in depth look into how the place worked, which you don't often get from cults/MLMs/whatever you want to call this).
Also a CBC Uncover podcast that came out earlier, which is a very good listen if you're interested in the NXIVM story as well (best to listen to before watching 'The Vow' IMO).
https://www.cbc.ca/radio/uncover/unc...xivm-1.4675949
Just messed up all around. With a particular added 'flair' by having the Vancovuer acting community being taken in by it.