Protector or Just Anti-Social

Az is now 6 years old and he really is my baby. Usually it is just me and him and home and I think he has really gotten used to that fact. I don't tend to have a lot of people over. Either he is just really anti-social or he seems to think I need protecting because he attacks just about everyone that comes over. I don't know what is going on but I really want the behaviour to stop. For one I am getting caught in the crosshairs because I don't want my friends to wind up bleeding all over my floors. And I really don't like it when he attacks and it hasn't been provoked. He was even stalking his prey the other day when a friend came over to study. For the first time ever I had to lock him in my room. Maybe I should have gotten him declawed after all. Open to suggestions if people have them.