Male Cat won't Stop Dominating Other Male Cat?

My two boys: popeye (2-3) and grandpa (1-2) have always had a superior (popeye) and inferior (gramps) complex between the two. However these days it seems popeye is becoming very aggressive when it comes to dominating. He will chase gramps down bit his next and hump, it's very frequent to where they fight. He will even chase him, they get along besides that but I don't like seeing this behavior. How to I stop it and should his balls be taken?

Male Cat won't Stop Dominating Other Male Cat?
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