From Wikipedia, the free encyclopedia Mack Swain (born Moroni Swain, February 16, 1876 – August 25, 1935) was an early American film actor, who appeared in many of Mack Sennett's comedies at Keystone Studios, including the Keystone Cops series. He also appeared in major features by Charlie Chaplin. In the early 1900s Swain had his own stock theater company, which performed in the western and midwestern United States. Swain worked in vaudeville before starting in silent film at Keystone Studio...