For those who come across this type of fraud, reporting is straightforward. You can report anonymously.

https://www.uscis.gov/scams-fraud-and-misconduct/report-frau...

https://www.uscis.gov/report-fraud/uscis-tip-form

I would also report as securities fraud to the SEC, but that is a higher hill to climb.

https://www.sec.gov/submit-tip-or-complaint/tips-complaints-...

(not calling OP out specifically, general guidance when you come across illegal labor practices)