Yeah, too young to remember them though
There will have been trouble with Liverpool before, but because of the joint hatred of Man United, I dont think its to an extent of the Chelsea rivalry.
As for supporters groups.
Pfft... Not really an English thing if you mean it like i think you do (i.e Ultras) because we just break out into violence.
There is the Leeds United Supporters club, but there is an ongoing battle between them and the club. The Supporters club used to be massive (and still has its fair share) but joining them no longer allows you to get tickets. Since Bates came in he basically set up his own supporters club.. Where you apply to get away tickets and get other priorites (as a normal supporters club would).
We arent really known for our supporters groups though, theyve certainly lost power now with the arrival of Bates etc a few years back.Were more associated with hooliganism (which explains our far reaching rivalries to some extent), the LSC been the main group, but thats another story.