Robert A. Clay Allison also known as Clay Allison was a cattle rancher, cattle broker, and sometimes gunfighter of the American Old West. He fought for the Confederacy in the Civil War. Allison had a reputation for violence, having survived several one-on-one knife and gunfights, as well as being implicated in a number of vigilante jail break-ins and lynchings. A drunken Allison once rode his horse through town nearly naked—wearing only his gunbelt. Later most reports stated that he was not only dangerous to others but himself, accidentally shooting himself in the foot.

Gunfighters, also called gunslingers, or in the late 19th and early 20th century, gunmen were individuals in the American Old West who gained a reputation of being dangerous with a gun and participated in shootouts. Today, the term "gunslinger" is more or less used to denote someone who is quick on the draw with a handgun, but this can also refer to those armed with rifles and shotguns. The gunfighter is also one of the most popular characters in the Western genre and has appeared in associated films, television shows, video games, and literature.