“What the Russian autocrats and their supporters fear most is that the success of libertarian Socialism in Spain might prove to their blind followers that the much vaunted "necessity of dictatorship" is nothing but one vast fraud which in Russia has led to the despotism of Stalin”

The Tragedy of Spain (1937)
Context: For two decades the supporters of Bolshevism have been hammering it into the masses that dictatorship is a vital necessity for the defense of the so-called proletarian interests against the assaults of counter-revolution and for paving the way for Socialism. They have not advanced the cause of Socialism by this propaganda, but have merely smoothed the way for Fascism in Italy, Germany and Austria by causing millions of people to forget that dictatorship, the most extreme form of tyranny, can never lead to social liberation. In Russia, the so-called dictatorship of the proletariat has not led to Socialism, but to the domination of a new bureaucracy over the proletariat and the whole people. …
What the Russian autocrats and their supporters fear most is that the success of libertarian Socialism in Spain might prove to their blind followers that the much vaunted "necessity of dictatorship" is nothing but one vast fraud which in Russia has led to the despotism of Stalin and is to serve today in Spain to help the counter-revolution to a victory over the revolution of the workers and the peasants.