Life magazine ran a pictorial series of the annual rally which sparked both fascination and concern about the violent, unruly nature of the growing subculture of motorcycle groups.
The event became known as the "Hollister Riot" although there is no real documentation that an actual riot occurred.
Afterwards, films about motorcycle clubs with members depicting bad behavior began hitting the movie theaters. The Wild One, starring Marlon Brando, brought particular attention to gang-type behavior displayed by members of motorcycle clubs.
The American Motorcyclist Association (AMA) defended the reputations of its members to the press, stating that 99 percent of bikers are law-abiding citizens, but there's that last "one percent" that are nothing more than "outlaws."
The term caught on and new motorcycle gangs emerged, called the "one-percenters," which included the Hells Angels.