The police are going to get faster and better results if the complainant and the offender are in the same area. Are you in Colorado?

Borked Privacy Group
1625 Mid Valley Dr #1
Steamboat Springs, CO 80487
US
970-846-3417

Whether the feds would want to get involved depends on the offence (interstate mail fraud comes to mind as one they might find interesting, but I don't know US criminal law that well). You'd have to start with your local force anyway.