Noam Chomsky states that:

"If you believe in freedom of speech, you believe in freedom of speech for views you don't like. Goebbels was in favor of freedom of speech for views he liked. So was Stalin. If you're in favor of freedom of speech, that means you're in favor of freedom of speech precisely for views you despise."
Source: In Manufacturing Consent: Noam Chomsky and the Media, 1992
"If we don't believe in free expression for people we despise, we don't believe in it at all."