rat pack

noun Slang.

a close-knit group of people with common interests who participate in various professional and recreational activities together.
Chiefly British. journalists or photographers as a group in relentless pursuit of celebrities.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for rat-pack

"juvenile gang," 1951, from rat (n.) + pack (n.). In reference to a Hollywood circle around Frank Sinatra, from 1958.