hooligan

Short definition from Wiktionary

Noun

1. 1
   A young person who causes trouble or violence, typically as a member of a gang or other group.
2. 2
   Ellipsis of football hooligan.
3. 3
   A member of the United States Coast Guard.
4. 4
   A type of fish, an anadromous smelt, Thaleichthys pacificus, found in the North Pacific.

Verb

1. 1
   To act as a hooligan (sense 1).
2. 2
   To treat (a person) roughly.