On the subject of private property and free speech, here is an article by George Reisman on the Ludwig von Mises Institute site: Free Speech and Occupy Wall Street.
Nevertheless, by the logic of the prevailing view of freedom of speech, protesters in the future will be able to storm into lecture halls and/or seize radio and television stations in order to deliver their message and then claim that their freedom of speech is violated when the police come to eject them, even though the police in such cases would in fact be acting precisely in order to uphold the freedom of speech. Indeed, since the days of the so-called Free Speech Movement at Berkeley, back in the 1960s, disruptions of speeches delivered by invited guests have occurred repeatedly on college campuses, in the name of the alleged freedom of speech of the disrupters. No attention has been paid to the actual violation of the freedom of speech of the invited speakers.
The prevailing view of freedom of speech is a major threat to freedom of speech. Not only does it provide justification for actual violations of freedom of speech of the kinds just mentioned, but it also makes freedom of speech appear to be a fundamental enemy of rational communication. Speakers cannot address audiences, professors cannot lecture to students if disrupters are permitted to drown them out and then hide behind the claim that they do so in the name of freedom of speech. If the prevailing view of freedom of speech were correct, the ability of speakers to speak and professors to lecture would require accepting the principle of the need to violate freedom of speech.Read the whole piece. I don't often recommend this site but, for once, its publication is spot on while approaching the subject from an unusual angle.