“He remained an obstinate idealist, however, whose faith in humanity's promise often tempted him into a sentimental proletarianism.”
“Racial proletarianism is similarly dependent on final victory.”
“On the other hand, far from being encouraged to revert to a quiescent proletarianism, working people were invited to participate fully in the new enterprise culture.”
(historical) In ancient Rome, the lowest class of citizens, who had no property; "regarded as contributing nothing to the state but offspring" (OED, 1992).
“The result of these processes is that for the first time in human history the majority of the world's people are proletarians, having nothing to sell but their labour power.”