The FCC's enforcement bureau is not very large or well resourced and is primarily concerned with issuing enforcement actions on licensed broadcasters. You can look at their public documents/listings of "Notes of Appparent Liability" for examples. Everyone who gets fined by the FCC is public recod.
https://www.google.com/search?client=firefox-b-d&q=FCC+enfor...
https://www.google.com/search?client=firefox-b-d&q=FCC+NAL+n...
The FCC used to be a lot more active in the 40s and 50s. Especially when there was a general hysteria and fear of soviet spies. The FCC still has various monitoring station everywhere, but they only use them for huge operations rather than policing hobby bands.