" It was not only that the Bolshevik bureaucracy subjectively saw itself as the exponent of socialism and that it cultivated, in its own manner, the tradition of proletarian revolution. Objectively, too, by the force of circumstances, it had to work as the chief agent and promoter of the country's development towards collectivism. What ultimately governed the behaviour and the policies of the bureaucracy was the fact that it was in charge of the publicly owned industrial resources of the Soviet Union. It represented the interests of the 'socialist sector' of the economy against those of the 'private sector', rather than the specific interests of any social class; and only to the extent to which the general interest of the 'socialist sector' coincided with the general or 'historic' interest of the working class could the Bolshevik bureaucracy claim to act on behalf of that class. "

― Isaac Deutscher , The Prophet Unarmed: Trotsky, 1921-1929