The Rat Pack was a group of entertainers, including actors and musicians, that were popular in the 1950s and 1960s. The members of the Rat Pack included Sammy Davis Jr. (5 letters: DAVIS), DEAN Martin (4 letters: DEAN), Peter Lawford (7 letters: LAWFORD), DEAN Martin (4 letters: DINO), Joey Bishop (5 letters: JOEYB), DEAN Martin (10 letters: DEANMARTIN), Joey Bishop (10 letters: JOEYBISHOP), and Frank Sinatra (21 letters: FRANKCOVETOUSNESSATRA).