It is not like it costs anything for you to file a report to the authorities. I would begin by reporting to the IRS and to immigration. Hope this perspective helps!
I would consider contacting the attorney general's office in Wisconsin. They will have a number of good resources to help you understand what options you have in terms of reporting something that concerns you.
You could also contact a good bankruptcy attorney to discuss what steps you might take if the above stated plan is implemented.
Legal disclaimer: I am licensed to practice law in the state of Washington and the answer provided above is for general information purposes only and should not be relied on as specific legal advice. This answer does not form an attorney-client relationship. You should consult with an attorney of your choice to fully advise you about your legal rights and obligations.