posse

Short definition from Wiktionary

Noun

1. 1
   A group or company of people, originally especially one having hostile intent; a throng, a crowd.
2. 2
   A group of people summoned to help law enforcement.
3. 3
   A search party.
4. 4
   A criminal gang.
5. 5
   A group of (especially young) people seen as constituting a peer group or band of associates; a gang, a group of friends.