A posse of people is a group of people with the same job or purpose.
例句
...a posse of reporters...一群記者A posse of Marsh's friends persuaded them that this was a bad idea.馬什的一群朋友勸他們說這是個餿主意。
N-COUNT
（舊時美國縣治安官調集協助其追捕罪犯的）民防團
In former times, in the United States, a posse was a group of men who were brought together by the local law officer to help him chase and capture a criminal.