The Rat Pack or the Clan was a very successful group of performers in the 1950s and 1960s. These performers were famous for their strong friendship and chemistry. The Rat Pack was made up of three main people: Frank Sinatra, Dean Martin, and Sammy Davis Jr. Their friendship was a huge part of why they were so successful – they had fun together and enjoyed making jokes and teasing each other. This close connection was one of the reasons why audiences loved them so much.