Wyatt Earp was a type of security guard.
A bouncer ( also known as a doorman , door supervisor or cooler ) is a type of security guard , employed at venues such as bars , nightclubs , stripclubs or concerts . Wyatt Earp . He was at different times a constable , city policeman , county sheriff , Deputy U.S. Marshal , teamster , buffalo hunter , bouncer , saloon-keeper , gambler , brothel keeper , miner , and boxing referee .