In my country, at the local championship, there are good rules for fans, specifically for those organized crowds that might cause trouble during their favorite team's games. This includes setting off firecrackers and throwing various objects onto the field, which could provoke unpleasant situations during the match. So these fan teams warn that their behavior could result in fines for the players themselves, regardless of whether they play well or not. I think these are good rules to curb those who sometimes act unnaturally, turning into a mob that, on the one hand, is easy to manage, but on the other, difficult to stop even for law enforcement.