Trotsky's writings and those of his followers were freely published in the middle and late thirties by the Hearst Press in America. His works on his "new kind of Communism" were published by the Franco Press at Salamanca and Burgos. The secret police of the Polish dictatorship were specially educated in Trotskyism in order to facilitate their work of espionage and disruption inside the Polish working-class movement.
From Trotsky to Tito (1951)