Vendetta

Noun

1. Revenge.
2. A bitter, destructive feud, normally between two families, clans, or factions, in which each injury or slaying is revenged: a blood feud.

   "The families had been locked in a bitter vendetta for generations."

3. (often preceded by personal) A motivational grudge against a person or faction, which may or may not be reciprocated; the state of having it in for someone.

   "personal vendetta"