How can EB-5 investors with denied I-829s avoid deportation when the project is allegedly involved in fraud?

If the investment was a fraud and the jobs not created, you have a problem. One option if you are put into removal proceedings is to apply for Cancellation of Removal for Permanent Residents under INA 240A(a). Another is to make a new investment, and a third is to explore other employment sponsorship options under EB-2/3 if employed.

Consult an attorney about litigation and another about other immigration options for you if your conditional residence is denied.

There is a process within the new EB-5 legislation for dealing with a project that has been the subject of fraud within the EB-5 program from a petition standpoint. Whether the SEC proceeding against the attorney will be enough is open to question. It would be better for you if the Regional Center itself was a party to the SEC order in my opinion. But as to deportation, one solution may be (emphasis on "may" and I have not confirmed accuracy of what I have heard) to find an existing EB-5 project that will take you aboard without any additional capital being deployed on your part. As for your securities and related fraud claims, 8 years is a long time. Be aware that statutes of limitation may preclude you and others from seeking relief against some parties. You should not be penny wise and pound foolish in waiting for a group of these investors to coalesce at the expense of your potential recovery. Time is of the essence.