https://www.cnn.com/interactive/2019/03/us/unlicensed-gun-dealers-invs/index.html
This article isn't the usual anti-gun, empty-headed opinion piece. It actually goes into considerable detail about how ATF identified and warned a particular gun owner / trader/ hobbyist that he seemed to be dealing in firearms without an FFL. Yet the guy kept doing it, and eventually he and his adult son were arrested by ATF for selling tables full of guns at gun shows, all as a "hobby"-- or so they claimed.
This article isn't the usual anti-gun, empty-headed opinion piece. It actually goes into considerable detail about how ATF identified and warned a particular gun owner / trader/ hobbyist that he seemed to be dealing in firearms without an FFL. Yet the guy kept doing it, and eventually he and his adult son were arrested by ATF for selling tables full of guns at gun shows, all as a "hobby"-- or so they claimed.