That's bad, but in Brazil, the Ultras(Organizadas) are, unfortunatly, waaaay worse. Last week, members of the Mancha Verde(Green Stain) beat a player in front of the stadium, and that's the 3rd time it happens in 3 years here. They also like to schedule "duels" online between organizadas, that usualy occur in subways and some open areas.
In my point of view, if you really want to support your club, you should become a member. You can get tickets earlier and still(at least in Palmeiras) be able to vote and make a real diference for your club. Also, as there are many diferent memberships(some that cost on ten bucks a month), everybody can be a part of it.
These Ultra people would rather sing for their Ultras than sing for their teams.