The bird that loves to drive off other birds, at least around here, is the mockingbird https://en.wikipedia.org/wiki/Mockingbird. For most of my life I thought its name was "Catbird" because that's what I was told when I was a kid. I've now learned that the real catbird https://en.wikipedia.org/wiki/Gray_Catbird gets it's name from its cat-like vocalizations. Although, to call a mockingbird a catbird is also an apt name since it love chasing cats, even when the cat is no threat and the birds nest is nowhere around they just love dive-bombing cats.
However, it's not just cats, these birds harrass anything and everything; they are just simply mean birds. I've even seen them attack morning doves, which really are no threat to them since their foodsource is so different. I never see a mocking bird eat out of my birdfeeder, like the doves; they much rather chase insects.