"Ostensibly, the aim was to strengthen the Soviet Union, to make it the economic, and hence the military, equal of the 'imperialist' powers still ranged against it. Yet Stalin always saw the strategic benefits of industrialization as secondary to the social transformation it implied. By forcing a huge transfer of manpower and resources from the countryside into the cities, he aimed to enlarge at a stroke the Soviet proletariat on which the Revolution was supposedly based. He succeeded: between 1928 and 1939 the urban labour force trebled in size. How precisely this was achieved was something Stalin's star-struck Western admirers preferred to ignore. Even as the working class was artificially bloated in size, around four million people were 'disfranchised' because they had been 'class enemies' before the Revolution. 'Non-toilers' found themselves ousted from their jobs, from schools and hospitals, from the system of food rationing, even from their homes. In Stalin's eyes, all surviving elements of the pre-revolutionary society - former capitalists, nobles, merchants, officiais, priests and kulaks - remained a real threat 'with all their class sympathies, antipathies, traditions, habits, opinions, world views and so on'. They had to be unmasked and expelled from the Soviet body politic. Only in late 1935, after years of denunciations, disfranchisements and all the attendant deprivations, did Stalin seem to signal an end to the campaign against the offspring of 'class aliens' - but only to turn public attention to a new category of 'enemies of the people'."