One Percenters
Hells Angels are by far the most recognizable motorcycle club, but that's because there aren't very many, to begin with. Most of those involved in illegal outlaw biker club activities are referred to as "1 percenters" because, for the most part, the other 99% of the riding club community are simply groups of people who love to ride motorcycles. This separates the Hells Angels from other riders based on intention because the Hells Angels strictly mean business.
Free Security
Would you mess with the Hells Angels? The HAMC once provided security for a free Rolling Stones concert. The club patrolled the Altamont festival in December of 1969 in exchange for free beer. Some smaller bands went on the record stating that they requested security from the HAMC, but they were all denied because the bikers didn't want to hang there.