Visit the homepage of the Immigration and Customs Enforcement (ICE) Office of Investigations to locate a special agent in charge (SAC) nearest to your location. The ICE Office of Investigations has a total of 26 SACs throughout the continental United States, each operating from a field office in a specific geographic region.
Click on the red dot that is closest to your geographic location on the U.S. map on the ICE website. Your state may not have a red dot but, the closest field office to your state will have jurisdiction to investigate your claim.
Contact the field office and ask to speak to a SAC. Tell them that you would like to report a visa violation. You will need to provide as much detail as you can about your allegation, such as the name of the violator, their full address and contact information, their state of residence and any other information that may helpful in investigating this violation.