J. P. Nettl said this quote

“ ...the working classes—that motor of social transformation which Marx increasingly stipulated for the role of the proletariat; the dispossessed and alienated revolutionary vehicle of his early writings, which later became defined and analysed into the collective worker who 'owner' nothing but his labour power—chains rather than assets. In the event, the working class actually came to fulfill most of the optimistic prognoses of liberal thinkers; they have become largely 'socialized' through access to privilege, consumption, organization, and voting participation, as well as obtaining massive social benefits. They have become supporters of the status quo—not vociferous perhaps, but tacit approvers and beneficiaries none the less. The ferment today comes from sections of the community to whom political and social thought has never hitherto assigned any specific role; who have hitherto never developed specific political institutions of their own: youth, mostly students; racial minorities, a few dissident intellectuals—these form the new 'proletariat'. The basis of their dissatisfaction is not necessarily and always an objective level of deprivation but rather a mixture of relative deprivation—consciousness of possibilities and of the blockages which prevent their attainment—and above all an articulate dissatisfaction with the society around them. There is no good reason why such groups should not form, and act like, a proletariat in a perfectly Marxist sense. The economic causality collapses; the analysis of a decaying bourgeois society and the determination to overthrow it remain. ”