If Bruce is biting you, then it's you that he has an issue with, not the other chickens. Unfortunately, biting is a behavior that takes a long time to train out of a cockerel.
I'm assuming these are cockerels under one year we're talking about. The behavior usually begins when their hormones flood their systems and color their world in a new way that confuses and confounds them.
If their human handler is uncertain as to what their role is with the flock, then the cockerel becomes confused, also, resulting in aggressive behavior as he tries to bring some control and order to his new world.
If you've ever trained a dog, you would know that establishing boundaries is the first rule. So it goes with cockerels. You will need to discipline him when he bites but show him you trust him by leaving him alone the rest of the time.
I had to train biting out of a Buff Brahma cockerel I had some years ago. It took a full year. Part of his problem was me. I noticed he would bite me if I made sudden and erratic moves close to him, startling him, and he would then slash at me with his beak.
While immobilizing him when he bit me, I also tried to moderate my own behavior by slowing down and being more precise when near him. It takes commitment and consistency and regular discipline, but you can change this behavior.
