Since most of these types of group disruptions are organized online, where is the NSA? Why don't they see this crap as it's being organized and send appropriate local police to handle it? Even if it were by telephone, the meta data should easily be able to pick up the pattern of the organizing of it. If they are going to invade our privacy they had better show us a return on our investment.
Actually I was being facetious at the fact words on a piece of paper (laws) do not in any real way deter determined criminals. Severe swift justice and or the probability of armed resistance by their intended victims does produce results.