A Critique of Pure Tolerance by Herbert Marcuse and co.

"Marcuse claims that tolerance shown to minority views in industrial societies is a deceit because such expressions cannot be effective. Freedom of speech is not a good in itself because it allows for the propagation of error; Marcuse believes that "The telos of tolerance is truth". Revolutionary minorities hold the truth and the majority has to be liberated from error by being re-educated in the truth by this minority. The revolutionary minority are entitled, Marcuse claims, to suppress rival and harmful opinions."

It depends on whether you mean leftism including its opposition to sexism and racism and such, or specifically the kind of lazy bourgeoisie pseudo-leftist liberalism that even leftists criticize today.