Do you want to close one of last options left for US people to buy/sell bitcoins?
an unethical company at the top places barriers for entry for an ethical competitor to take over from them, defrauds their customers, and reduces trust in the currency. If they are frauds they should be closed.
The question is, ARE they frauds or is the OP blowing hot air. I am not personally familiar with the company or their alleged misconduct.
I have had no issues with them and I would say that a class action law suit would be pretty extreme measures. Sorry but I dont support this.