There are many motorcycle riders in the world, but only a select few join outlaw biker clubs. These organizations tend to have radical ideas; they're distinguished from other biker groups by their occasionally illegal activities and stringent rules.
Some of the regulations are simple mandates all motorcycle club members must follow. Other rules are unique to particular clubs such as the Hells Angels, the Bandidos, or the Outlaws. Members must follow each set of regulations or else face strict punishment.
For example, club members must adhere to a code of conduct while wearing their outlaw club's colors, and women who associate with the groups are expected to behave in specific ways. In fact, many of these bikers appreciate a military-style hierarchy. Rules are integral to life in an outlaw biker club.