Why the Irvine 11 are being prosecuted

Shavua tov u'moadim l'simcha, a good week and a continued happy holiday to all of you.Last Friday, eleven Muslim 'students' were arraigned in a California court and plead not guilty to charges stemming from their disruption of a speech by Israeli Ambassador to the United States Michael Oren in February 2010. How could someone be criminally charged for exercising their right of free speech by