after the failure of the revolution in Germany, Stalin reasoned that industrializing and consolidating Bolshevism in Russia would best serve the proletariat in the long run. The dispute did not end until Trotsky's assassination in his Mexican villa by Stalinist assassin Ramón Mercader in 1940. Max Shachtman, one of the principal Trotskyist theorists in the United States, argued that the Soviet Union had evolved from a degenerated worker's state to a new mode of production called bureaucratic collectivism, whereby orthodox Trotskyists considered the Soviet Union an ally gone astray. Shachtman and his followers thus argued for the formation of a Third Camp opposed to the Soviet and capitalist blocs equally. By the mid-20th century, Shachtman and many of his associates, such as Social Democrats, USA, identified as social democrats rather than Trotskyists, while some ultimately abandoned socialism altogether and embraced neoconservatism. In the United Kingdom, Tony Cliff independently developed a critique of state capitalism that resembled Shachtman's in some respects, but it retained a commitment to revolutionary communism. Other interpretations Some historians and writers, such as German Dietrich Schwanitz, draw parallels between Stalinism and the economic policy of Tsar Peter the Great, although Schwanitz, in particular, views Stalin as "a monstrous reincarnation" of him. Both men wanted Russia to leave the western European states far behind in terms of development. Both largely succeeded, turning Russia into Europe's leading power. Others compare Stalin with Ivan the Terrible because of his policies of oprichnina and the restriction of the liberties of common people. Some reviewers have considered Stalinism as a form of "red fascism". Although fascist regimes were ideologically opposed to the Soviet Union, some positively regarded Stalinism as evolving Bolshevism into a form of fascism. Benito Mussolini positively reviewed Stalinism as having transformed Soviet Bolshevism into a Slavic fascism. British historian Michael Ellman had written that mass deaths from famines are not a "uniquely Stalinist evil", noting that throughout Russian history, famines and droughts have been a common occurrence, including the Russian famine of 1921–22 (which occurred before Stalin came to power). He also notes that famines were widespread worldwide in the 19th and 20th centuries in countries such as India, Ireland, Russia and China. Ellman compared the behaviour of the Stalinist regime vis-à-vis the Holodomor to that of the British government (towards Ireland and India) and the G8 in contemporary times, arguing that the G8 "are guilty of mass manslaughter