Eating at the Mafia Front

Today we went to lunch at an Italian restaurant near the central train station in Naples which was recommended by my Lonely Planet book. The guy at the entrance was very nice and ushered us in to sit down inside. We immediately noticed that there weren't any other customers inside, just some guys sitting around talking whom all seemed to know each other. Then as we ate, some big guys came in with briefcases. They all sat down and started talking seriously with each other. We weren't sure what to think so we ate up and didn't ask any questions. On the way out we noticed that the wife and son of one of the guys were waiting outside. I guess they knew to stay out of the way...