There are ATF guys who walk around large gun shows in "casual clothes" and try to talk dealers and customers into doing something illegal. We all knew they were ATF but they would come to our shows anyway. I used to see this all through the 1990s on the Midwestern U.S. show circuit. They all looked like they got lost from the country club and stood out from everybody else.
Yeah, I would like to know if they paid the same table fees as the rest of us. Nah. Pay no attention to the ones sitting at a table. They're just window dressing. But look at everybody else like they might have a gold badge.