It must have been as the Raiders have seemingly always drawn this element. My company had season tickets in LA for both the Rams and Raiders, plus I had season tickets for USC. The crowd for Raider games was a far different element then we saw at both the USC and Ram games.
We gave up the Raider tickets mainly because of the propensity for fights and altercations at their games.
I remember going to LA Coliseum it was scaryyyy
I do remember even if Raiders sucks on the field you could always count on good fights in the stand (sarcastic on)