This is a sign of solidarity, and in the event that a group is up to something nefarious, it can be a grim reminder to a rival onlooker that Hells Angels members stick together through thick and thin.

Jay Dobyns is a retired ATF agent who went undercover with the Hells Angels from 2001 to 2003 as part of Operation Black Biscuit. He speaks with Insider about his experience with the outlaw ...