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Friend was brainwashed by MLM-/ponzi investment scam. What can I do?
I believe the only thing you haven't mentioned to him is the possibility that his activity is criminally fraudulent. I would sit him down, and say something substantially similar to the following: We've talked about your investment before, and I know you believe it's fine.  I just want to make sure you understand that this is very likely fraudulent activity.  I know you believe in it, but you've said you don't understand how or why it works.  The problem with that is that if it is a fraud you can't protect yourself from criminal prosecution because you didn't understand what you were doing.  The prosecutor will ask you if you asked others to give you or the organization money, and then they will convict you based on trying to defraud others. It doesn't matter whether you did it on purpose, or just because you believed the people you are investing in. So I very strongly advise you to understand exactly what the system is, and how it works, and then make sure with a lawyer that it's legal.  If it is, then hey, you've learned something valuable.  But if it's not, then you will save yourself a whole lot of trouble and anguish down the road if you step away before someone you attract to the investment decides to talk to their accountant or lawyer.  A civil lawsuit may be bad, but if you're criminally prosecuted it will be so much worse. Now that I've said my piece, I won't talk to you about it anymore or bother you about it. I wish you luck, and hope that things work out fine. I wouldn't talk to the police or suggest that I'd do anything of that nature, without proof then there's no real way to start an investigation anyway, and unfortunately scams like this are incredibly hard to investigate, so the police often spend little to no time on them without a high level insider giving up evidence and associates. Chances are good nothing would happen to your friend - one day the organization will disappear and he won't recover any more money - but there's a distinct possibility that when that happens, the people below him will come for him, and he won't be able to look further up the chain for help. Perhaps the threat of illegal activity will be enough to prevent him from defrauding others, but if not I think at least you can let it go, and know that you've done everything for him that might work.