A slapstick comedy troupe, directed by Mack Sennett, from the silent-film era. Famous alumni include the great character actor Edgar Kennedy (with wide-ranging credits, including Little Rascals shorts and films with the Marx Brothers and W.C. Fields), and silent-film star Fatty Arbuckle. The term "Keystone Kops" is often used to denote ineptitude, especially when the dolts in question are authority figures.