The negations resultant from capitalist modes of production, relations of production, and ideology did not manifest themselves as an eradication of oppositions among the working classes. Instead, the dialectic of proletarianization disciplined the working classes to the importance of distinctions: between ethnics and nationalities; between skilled and unskilled workers; and, as we shall see later in even more dramatic terms, between races. The persistence and creation of such oppositions within the working classes were a critical aspect of the triumph of capitalism in the nineteenth century.

Cedric J. Robinson, Black Marxism_ The Making o…, loc. 296