This excerpt is pretty shocking - from Herbert Marcuse's Wikipedia page:
Many radical scholars and activists were influenced by Marcuse, such as Norman O. Brown, Angela Davis, Charles J. Moore, Abbie Hoffman, Rudi Dutschke, and Robert M. Young (see the List of Scholars and Activists link below). Among those who critiqued him from the left were Marxist-humanist Raya Dunayevskaya, fellow German emigre Paul Mattick, both of whom subjected One-Dimensional Man to a Marxist critique, and Noam Chomsky, who knew and liked Marcuse "but thought very little of his work." Marcuse's 1965 essay "Repressive Tolerance", in which he claimed capitalist democracies can have totalitarian aspects, has been criticized by conservatives.[unreliable source?] Marcuse argues that genuine tolerance does not permit support for "repression", since doing so ensures that marginalized voices will remain unheard. He characterizes tolerance of repressive speech as "inauthentic". Instead, he advocates a form of tolerance that is intolerant of repressive (namely right-wing) political movements:
Liberating tolerance, then, would mean intolerance against movements from the Right and toleration of movements from the Left. Surely, no government can be expected to foster its own subversion, but in a democracy such a right is vested in the people (i.e. in the majority of the people). This means that the ways should not be blocked on which a subversive majority could develop, and if they are blocked by organized repression and indoctrination, their reopening may require apparently undemocratic means. They would include the withdrawal of toleration of speech and assembly from groups and movements that promote aggressive policies, armament, chauvinism, discrimination on the grounds of race and religion, or that oppose the extension of public services, social security, medical care, etc.