I did more research than needed on this and found the following. The main known "top men" of some of these groups have been told by non other than the KGB that they better be good boys or their world will get a lot worse than it may already possibly be. To the point these fellas are leaving their home town on match days so they are well away from any hassle. I understand these groups are not exactly loyal to Putin but are anarchists in a sense. Many are bored young men with to much time on their hands so find solace in these fight clubs of sorts.
It seems though the powers that be have put the shits up the main guys good and proper. The chap interviewed for the piece i read did it on the premise of strict anonymity.
So it seems organized stuff by known thugs may not happen but that is not to say they will all follow the leader as it were.