There's a reason that we have police departments and not posse's roaming around bringing "justice" to people.
The posse members were often present at the sensational immigration raids, directing traffic and riding along with deputies.
He once told me he got the idea for his posse from all the Western movies he watched as a child.
1640s (in Anglo-Latin from early 14c.), shortening of posse comitatus "the force of the county" (1620s, in Anglo-Latin from late 13c.), from Medieval Latin posse "body of men, power," from Latin posse "have power, be able" (see potent) + comitatus "of the county," genitive of Late Latin word for "court palace" (see comitatus). Modern slang meaning "small gang" is probably from Western movies.
: I thought posses were Jamaican. Language changes very fast here, now it just means a small gang
[1980s+ Black teenagers; probably fr the sheriff's posse seen so often in cowboy movies]