Radicalism is not free speech

So the U.S. Supreme Court has determined that hateful and often violent action constitutes protected free speech.

The U.S government and the courts have had a long, tumultuous relationship with the rights of the citizenry to participate in speech critical of the government and others, including the rights to assembly and freedom of association that allow the people to voice their opinions singularly or collectively without fear of imprisonment. However, a recurring theme in this right to protected free speech is that it is protected as long as it is executed in a peaceful manner. For the preservation of public safety, speech that is destructive, and assemblies and associations that are violent, are not generally considered protected. Thus, the passing of pamphlets is protected; the throwing of bricks and bombs is not.