Herbert Marcuse on suspending free speech to prevent radical right-wing movements

In past and different circumstances, the speeches of the Fascist and Nazi leaders were the immediate prologue to the massacre. The distance between the propaganda and the action, between the organization and its release on the people had become too short. But the spreading of the word could have been stopped before it was too late: if democratic tolerance had been withdrawn when the future leaders started their campaign, mankind would have had a chance of avoiding Auschwitz and a World War.

The whole post-fascist period is one of clear and present danger. Consequently, true pacification requires the withdrawal of tolerance before the deed, at the stage of communication in word, print, and picture. Such extreme suspension of the right of free speech and free assembly is indeed justified only if the whole of society is in extreme danger.

~ Herbert Marcuse, "Repressive Tolerance," 1965