We could look at the Pslam this morning PS 111 4-9.
But I agree the idiots who denied free speech  should have allowed him to speak. In the past the KPD did the same and with the Riechstag fire , they gave the Nazis the opportunity to ban free speech , they did this along with the Catholic Centre Party, so the guy  should have been allowed to speak in Berkley but to an empty house or only with the fools who  actually believe mistakenly that  trumpin will bring about real change . 
This man bringing "Hope and Change" has already pared back the banking regulation brought into protect ordinary Americans. Do not be surprised if the US and the world will have a new "Financial Crisis" in five years from now due to looser regulation . And this will further lead to the American Middle Class becoming an even more endangered spiceies....