She claims that the police have a 'vendetta' against her. [=that the police are deliberately and unfairly trying to cause trouble for her]
He waged a personal 'vendetta' against his rivals in the Senate.
(..) This guy wears a mask like an outlaw. He's hunting down criminals that all look the same... ...like he's got some sort of personal vendetta. But he's not protecting innocent people, Mr. Parker. Let's get some air, Peter. - Dad, we need to talk. - Yes, we do. (..)2012 The Amazing Spider-Man