If you've noticed favoritism in your management, signs of incompetence, or if the organization seems to be staffed primarily with people from a specific country, visa holders, vendors, or consultants, promotions for speciality visa holders on management zones, you can report it to HR.
If HR doesn’t take action, you can report it directly to USCIS using the link below:
https://www.uscis.gov/report-fraud/uscis-tip-form
You can stay anonymous, and if you have any specific violations and proof, action will be taken.