My experience is that when entering the curva, you are like entering in another country where the rules are those imposed by the curva bosses. I.e. you have to sing only chants launched by the boss and behave well during games e.g. not throw any thing on the pitch
, obviously if they tell you to throw you can throw objects.
One have to say that many of them have no ambition in their life expect to see the team in all matches and wherever they play.