Christopher Jon Bjerknes
The FTC investigates potential antitrust violations. The Federal Trade Commission has published a brochure in pdf format which you can download here:
https://www.ftc.gov/system/files/attachments/competition-counts/pdf-0116_competition-counts.pdf
Page seven of the brochure provides the following contact information:
E-mail: antitrust@ftc.gov
If you wish to submit confidential information, send it by mail and mark it "Confidential."
Mail: Federal Trade Commission
Bureau of Competition-H374
Washington, D.C. 20580
Telephone: 1-202-326-3300
Everyone is equally free to confidentially inform the FTC of potential monopolies and other antitrust violations which obstruct free and fair trade.