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He became one of the most popular acts in Las Vegas and was known for his friendship with fellow artists Frank Sinatra and Sammy Davis Jr. , who together formed the Rat Pack .
 location: Las Vegas; person: Frank Sinatra; person: Sammy Davis Jr.; organization: Rat Pack
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Las Vegas; person: Frank Sinatra; person: Sammy Davis Jr.; organization: Rat Pack