If you or your children are being harassed or threatened, report the activity. Many schools have instituted bullying programs, so school officials may have established policies for dealing with activity that involves students. If necessary, contact your local law enforcement. Law enforcement agencies have different policies, but your local police department or FBI branch are good starting points. Unfortunately, there is a distinction between free speech and punishable offenses, but the law enforcement officials and the prosecutors should decide the legal implications.