That's whataboutism at play.

No, its directly on the nose. Either your argument that its different because "Nazism resulted in the murder of 30 million people" is valid or not. Your predicate is what is at question and therefore not whataboutism.

K, fine, we'll play the whataboutism game. Chomsky is not a communist, he's more a socialist, and he has, in fact, spoken out against the Soviet Union and Soviet communism. Since he's not advocating for racial and ethnic cleansing and oppression, he's not quite the same as the neo-Nazis.

Notice you ignore the blacklist, which is the more relevant point.

As far as Chomsky goes, this is actually a great illustration of the problem. I think he's a Communist, you disagree. Well guess what- a lot of the 'protestors' in Charlottesville were white Nationalists with Nazi overtones, some were hardcore Nazis, some were dabbling alt-righters. So who decides which or any of them gets to protest/speak? You, me, the government, Google?

Its not just a slippery slope, its an avalanche of stupidity to try to do viewpoint censorship.