During the later 1930s he intervened in the debates involving Leon Trotsky, James Burnham and Yvan Craipeau concerning the nature of the Soviet Union.
Adherents of this view, espoused most explicitly by Max Shachtman and closely following the writings of James Burnham and Bruno Rizzi, argued that the Soviet bureaucratic collectivist regime had in fact entered one of two great imperialist "camps" aiming to wage war to divide the world.
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