“The inhuman character of Stalinism was demonstrated by the repressions of prisoners of war who survived fascist camps and then were thrown into Stalinist camps, the anti-worker "decrees," the criminal exile of entire peoples condemned to slow death, the unenlightened zoological kind of anti-Semitism that was characteristic of Stalin bureaucracy and the NKVD (and Stalin personally), the Ukrainophobia characteristic of Stalin, and the draconian laws for the protection of socialist property (five years' imprisonment for stealing some grain from the fields and so forth) that served mainly as a means of fulfilling the demands of the "slave market."”

Ch. 11 https://www.marxists.org/archive/trotsky/1936/revbet/ch11.htm
The Revolution Betrayed (1936)

Progress, Coexistence and Intellectual Freedom (1968), Dangers, Police Dictatorships
Context: The anti-people's regime of Stalin remained equally cruel and at the same time dogmatically narrow and blind in its cruelty. The killing of military and engineering officials before the war, the blind faith in the "reasonableness" of the colleague in crime, Hitler, and the other reasons for the national tragedy of 1941 have been well described … Stalinist dogmatism and isolation from real life was demonstrated particularly in the countryside, in the policy of unlimited exploitation and the predatory forced deliver­ies at "symbolic" prices, in almost serflike enslavement of the peasantry, the depriving of peasants of the simplest means of mechanization, and the appointment of collective-farm chairmen on the basis of their cunning and obsequiousness. The results are evident — a profound and hard-to-correct destruction of the economy and way of life in the countryside, which, by the law of interconnected vessels, damaged industry as well.

Interview (5 October 1990) as quoted in La Repubblica https://ricerca.repubblica.it/repubblica/archivio/repubblica/1990/10/05/parla-kaganovich-non-siamo-dei-mostri.html

Source: The Faces of Janus: Marxism and Fascism in the Twentieth Century, (2000), p. 6

This term automatically rendered it unnecessary that the ideological errors of a man or men engaged in a controversy be proven; this term made possible the usage of the most cruel repression, violating all norms of revolutionary legality, against anyone who in any wat disagreed with Stalin, against those who were only suspected of hostile intent, against those who had bad reputations. This concept 'enemy of the people' actually eliminated the possibility of any kind of ideological fight or the making of one's views known on this or that issue, even those of a practical character. In the main, and in actuality, the only proof of guilt used, against all norms of current legal science, was the 'confession' of the accused himself.
"Secret Report to the 20th Party Congress of the CPSU"

Speeches, Moscow Address

Dissertation for doctor of philosophy in christian education (May 25, 1991)

Source: Lethal Politics: Soviet Genocide and Mass Murder since 1917 (1990), p. 152

24 February, 2016, after having been named person non grata in Pontevedra -his place of birth.
As President, 2016
Source: 20 Minutos http://www.20minutos.es/noticia/2681078/0/entrevista-rajoy-espejo-publico/