posse
n.a group of friends who spend a lot of time together. It can also mean a group of people who are helping a leader or a police officer.
n.a group of people who accompany a person, often for protection or social status; historically, a body of men summoned by a sheriff to assist in law enforcement.
“He arrived at the party with his whole posse.”
“The pop star never travels alone, usually surrounded by a posse of bodyguards and assistants.”
Often used with a possessive pronoun ('my posse', 'his posse') to indicate a personal social group.
“A posse of directors, including Michael Powell, bring Alexander Korda’s Arabian Nights fantasy to the screen.”
Ellipsis of posse comitatus.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.