Noun
vendetta - A blood feud in which the family of a murdered person seeks vengeance on the murderer or the murderer's family

As the final act of his vendetta against Rugen, Inigo pulled out his sword and said, "Hello. My name is Inigo Montoya. You killed my father. Prepare to die."
hypocrisy - Behavior that is the opposite of how one actually is, being fake by pretending to be one thing, and acting in the opposite way.

The politician was guilty of hypocrisy because he promised reforms, but his real goal was to enrich himself and his friends.