I was involved in a class action case against dishonest top executives. In that case the company lied; some say they just misplaced some decimal points, maybe 3 or 4 places, to inflate the earnings report. After the stock ran up on the earnings news they shorted the company stock big time (knowing the lie wouldn't hold up for long). As rumors started about the amazing earnings being unsubstantiated the guys closed their short positions and left the country.
I don't know how the C.A. was initiated or how they got to these guys, but after some years I recieved maybe 10% of what I had invested. I continued to recieve much smaller sums from several more years of related court proceedings, including this past year.
This would seem to be an incouraging story supporting a C.A. against PTSC. But the C.A. targets in my previous case had pockets full of money.