I had a few that were evil to hens, trying to draw blood on them, if fact I have one now I am considering "processing" because he keeps attacking hens for no reason... anyway, I take the mean ones and hold them upside down. I walk around with them like that for about a minute, then make them sit in my arms while I give them the Vulcan Mind Meld. I talk to them in a deep voice and crow at them a few times, then I put them back in the coop. Most stop for awhile, some don't. Those that don't have to go. I have one rooster that is my Alpha and he's never been mean to another chicken, or to me, and he spends most of his time watching guard. He's the one I'll be keeping as long as possible.