It seems you have posted this issue in multiple threads, which is fine, but what steps have you taken so far?
Have you filed a police report either in your home town or the town where this outfit operates? You can't get someone criminally charged (to be sent to jail) if you don't file a report of fraud. Reporting the issue to the state Attorney General in your home state and the state where the outfit is located, while it may seem like a waste of time, is important. They track these issues and if they start to see a pattern or a lot of people impacted, they will file charges and they will prosecute. However, if no one ever reports the issue, they have nothing. People won't report because they think it won't do any good, but we have seen many reports on these boards where these crooks have been sent to jail and forced to pay millions of dollars in fines (which they will probably just bankrupt). It happens, but has no chance of happening if you don't report the issue to the state AG's office or filling a police report.
In addition to this, you could perhaps get your attorney involved to write a refund demand letter on legal letterhead and send it to them. Again, it may not be fruitful but if you later file a small claims court lawsuit, it will show you made attempts to reclaim the stolen money.
I really think your important next steps are to file a police report and contact the state AGs. A class action lawsuit probably won't work. Attorneys know you can't get blood from a stone, the money is gone. I doubt the guy is just sitting on bags of the cash he stole. No attorney will take this up. This is something for a prosecutor to get involved in. Unfortunately, even if he is caught and prosecuted, you may need to consider the money gone.