As a previous owner/partner in several large poolrooms, I can tell you the emphasis is always on keeping an eye on what's going on inside the room. I constantly walk around the place and check out the people and see what's happening in every nook and cranny. If someone is getting too loud, I will walk over and just watch them for a while. Usually they get the message without me saying anything.
My philosophy is that the poolroom is neutral territory, where all people can mingle safely. I don't care what a guy does on the outside, in here he must mind his manners. He can be a gang leader or a dope dealer (I can't screen everybody) but when he is in my room, he must respect my equipment and the other customers. PERIOD!
The word gets around quick what you can or can't get away with in a place. The worst thing you can do to someone who wants to hang around your spot, is kick them out. So they mind their manners because they want to stick around. I have no problem confronting the biggest guys (and we had them at Hollywood Park) and telling them they have to keep it down, or not to sit on the tables, or don't set their drinks on the rails. I think they respected the fact that I would approach them myself with no bodyguards or other help.
My philosophy is that this is my place and I pay the bills. So the only one that is going to run it is me. I had one encounter with a gang member once where he said he would kick my ass if I bothered him anymore. He had three gangster buddies with him and they were playing pool, drinking beer and raising hell. I looked at him and told him he would have to kick my ass and eat me too. They all started laughing and that was the end of it.
So that's how I took care of things inside. Outside is another story. Sh-t happens in parking lots that can be out of your control. Hollywood Park had security to the max outside and still there were occasional fights, robberies and even a shooting or two. The most exciting part of my day was walking out at night with the days receipts in my pocket. It was after two in the morning and I was alone. Yes, I was packing my little .25 but I watched all around me to see if anyone was following me or hiding somewhere. I never parked in the same spot two nights in a row.
I know the brothers all respected me, but there were still a lot of outlaws in that neck of the woods. Just being extra careful was all I needed. And I was, every single night for four years. I was well aware of the potential dangers in being complacent.