Look at the Paris Commune. That was the Dictatorship of the Proletariat.

The dictatorship of the proletariat.

The proletariat uses the State not in the interests of freedom but in order to hold down its adversaries, and as soon as it becomes possible to speak of freedom the State as such ceases to exist.

Just as Marx used to say about the French "Marxists" of the late seventies: "All I know is that I am not a Marxist

Everything must justify its existence before the judgment seat of Reason, or give up existence.

The state is nothing but an instrument of opression of one class by another - no less so in a democratic republic than in a monarchy.