I think there'd be a lot of contention when it comes to naming the biggest bullies on the field but if we only consider football managers for this title then I do think a couple stand out above the rest. Here's one list of nominations for:

Football's Biggest Bullies

Do you have any others, if so nominate more in your comments.
That aside for what its worth I'm betting on Werder Bremen taking the UEFA Cup title tonight :)