Michael J Totten interviews the author Benjamin Kerstein. He begins with the question, “What possessed you to spend three years writing about Noam Chomsky?”

To which Kerstein answers,

Chomsky is an absolutely shameless liar. A master of the argument in bad faith. He will say anything in order to get people to believe him. Even worse, he will say anything in order to shut people up who disagree with him. And I’m not necessarily talking about his public critics. If you’ve ever seen how he acts with ordinary students who question what he says, it’s quite horrifying. He simply abuses them in a manner I can only describe as sadistic. That is, he clearly enjoys doing it.

A little elaboration follows:

He is essentially the last totalitarian. Despite his claims otherwise, he’s more or less the last survivor of a group of intellectuals who thought systemic political violence and totalitarian control were essentially good things. He babbles about human rights all the time, but when you look at the regimes and groups he’s supported, it’s a very bloody list indeed.

And,

He makes people stupid. In this sense, he’s more like a cult leader or a New Age guru than an intellectual… Since he portrays everyone who disagrees with him as evil, if you do agree with him you must be on the side of good and right… I think people come to Chomsky and essentially worship him for precisely that reason. He allows them to feel justified in their refusal to think… His tone is very intellectual, in that he speaks in a very quiet, measured style most of the time. But the content is clearly driven by what can only be called a species of hysteria… He seems to be at heart an extremely angry man, and I would guess that his anger is driven by something that is ultimately not political.

From then on in it gets rather critical.

See also this, by the late Christopher Hitchens. And of course this.

Update, via the comments: