If you live far away from this, you notify the FBI and Police, as appropriate.
If you live close by, you evaluate what it means to you, and if you are serious you follow a scorched earth policy.
If you are a kid, you think you can walk up to someone, punch them in the face, and walk away smiling. When you grow up, you realize that doesn't happen. You do what you have to do, and pay for it.
I don't like scammers or people who deliberately hurt others for their own gain. I'm torn though: if I went the route of notifying his job/boss and going through the police, then my name would be associated with it. I'd have to stay on the up and up.
If not though, I'd be free to do other less scrupulous things with lower risk of having to pay large for it.
I think it's interesting how many people talk the talk on this thread and ask for vids and such - if someone really dealt with this guy on a personal level, they'd be smart to never acknowledge it.