Do outlaw motorcycle clubs have a enforcer in the ranks?

In the gang the enforcer is the sergeant at arms who is fiercely loyal to the president and usually amongst the toughest members who undertakes the job of keeping fellow riders in check and has the ability to draft in other patched members if the need arises. Outside of the gang all patched members have an obligation to defend the club or lose their patch, which the sergeant at arms will confiscate by force if necessary due to the club charter not being upheld.