Mr. Chomsky is making a slight error. When he says "libertarianism," he means "liberalism," and seems to be referring to Enlightenment liberalism typified by John Locke etc. Europeans don't use the term libertarian particularly. In any case, in its American usage, libertarian nearly always refers to a more exaggerated form of liberalism than Adam Smith would have envisioned. Liberalism contained checks on personal freedom for the common good. Libertarianism as theorized by Robert Nozick or Austrian economists such as Hayek contains no such checks. This is a quibble, really.