Chomsky could, I suppose, be taken as a heretic. After all, he did write an introduction for a book that denied the Holocaust. He also traveled to Lebanon and had hail-fellow-well-met meetings with the leaders of Hezbollah.
He also demands that people divest from Israel -- a nation he has criticized -- while owning several million dollars of real estate in the U.S., a nation he has criticized a lot more -- to worldwide applause. Indeed, in a poll a few years ago -- Europeans rated him the world's most important intellectual. Anti-Americanism and anti-semitism (often, not always, dressed up as anti-Israeli sentiment) are some of the most widely accepted normative beliefs in the world today.
All of these would be criticized by many on the American right, but, with the partial exception in developed countries of Holocaust denial, most of the world's people would have no problem with them.
You seem to see Chomsky as a heretic. I see him as a prime example of something Eric Hoffer wrote about over a half-centruy ago in _The True Believer_: the formerly creative man who has lost his powers and who compensates by becoming a fanatic. Chomsky's books are international bestsellers. Chomsky's MIT faculty peers made him an Institute Professor. I'm a fan of your writing PG, but I'm sorry, I'm missing the heretical heroism. YMMV.