Which is why I have said in my thread, take the matter to the small claims court.Will not cost you any thing other than and time and very little money, and the best part if the court feels like it, and when they don't pay up then, they will prosecute without costing you any further money.
Going to small claims court will automatically, get them a summons to appear in court and which if they fail to appear, gets them arrested.Once you start legal proceedings, it should be enough to get their attention.Be warned it will take awhile, the court, if you win, and based on evidence presented, may further institute criminal charges.
So totally up to you,just remember do not have any further contact with members, do not threaten parties, do no do any thing stupid, that will and can result in a case being thrown out.Simply inform them in writing with the intention of taking them to small claims court, and see if they bite.If they don't take them to small claims.What you should do, is each involved party that got scammed should go to small claims court, and get a case.Forward this information and any documentation to the parties, present it to the court.
The judge will question it, perhaps.