Conspiracy to Commit Riot?

At the DNC they said they owned the sidewalk, and now we have this travesty of the law-there is no law called Conspiracy to Commit Riot, only a law against actual rioting-happening in conjunction with the RNC. Ask yourselves what the powers that be are so afraid of that they must engage in "free speech zones", which by definition are antithetical to the very idea of free speech, and preemptive arrests justified by laws that do not exist? I hope it is clear that neither party is your friend, and that going forward, should you have any intention of expressing dissent, you would be better off doing so in an unconventional, unorganized fashion. http://www.salon.com/opinion/greenwald/2008/08/30/police_raids/