We don't know how often the police have complained to the bike group or not. Or other bike groups if there's multiple bike groups that are doing this...

The faq on the stone mountain site says that you can ride a bike if you do it single file on the road.... not even the 2 abreast that seems to be the Georgia standard.

I know around here, the police routinely step out in front of your car and wave you over if you're violating HOV restrictions, don't have your personal property tax sticker, or you're driving in a shoulder to get to an exit faster in traffic.

None of those are terrible traffic violations that require a person to physically step in front of your car, but cars stop without crashing, and deal.