A young Frank Sinatra joined the Rat Pack in the 1950's.
The original (1950s) members of the Holmby Hills Rat Pack were
Frank Sinatra (pack master), Judy Garland (first vice-president),
Lauren Bacall (den mother), Sid Luft (cage master), Humphrey Bogart
(rat in charge of public relations), Swifty Lazar (recording
secretary and treasurer), Nathaniel Benchley (historian), David
Niven, Katharine Hepburn, Spencer Tracy, George Cukor, Cary Grant,
Rex Harrison, and Jimmy Van Heusen.