Sorry, but holocaust denial is not now - and never was - protected speech. Freedom of speech never protected untruth! In fact the most famous free-speech case was that one John Peter Zenger in 1735. Mr. Zenger was accused of defaming the British Governor of New York. He was acquitted by a jury on the grounds that what he had printed was the TRUTH! The inescapable conclusion is that untruth in not protected!
Hundreds protest by Tel Aviv club where 'rape video' was filmed calling for club's closure (Haaretz)
from the article: U.S. Jews block conference set to include anti-Israel professors