A "biker gang" refers to a group of people who ride motorcycles together. They often have a strong bond and may engage in various activities together, but some biker gangs may also be involved in illegal or criminal activities. Full definition
There was speculation that he was part of a notorious biker gang. (remonline.com)
The last thing you want to do is accidentally get involved with someone who is in an actual biker gang. (bikerdatingsites.us)
Released by LucasArts in 1995, Full Throttle is a classic graphic adventure game from Tim Schafer, telling the story of Ben Throttle butt - kicking leader of biker gang the Polecats, who gets caught up in a tale of Motorcycles, Mayhem and Murder. (metacritic.com)