Jurgis recollected how, when he had first come to Packingtown, he had stood and watched the hog-killing, and thought how cruel and savage it was, and come away congratulating himself that he was not a hog; now his new acquaintance showed him that a hog was just what he had been-one of the packers’ hogs. What they wanted from a hog was all the profits that could be got out of him; and that was what they wanted from the workingman, and also that was what they wanted from the public. What the hog thought of it, and what he suffered, were not considered; and no more was it with labor, and no more with the purchaser of meat. That was true everywhere in the world, but it was especially true in Packingtown; there seemed to be something about the work of slaughtering that tended to ruthlessness and ferocity-it was literally the fact that in the methods of the packers a hundred human lives did not balance a penny of profit.

• Upton Sinclair, The Jungle

Published over a century ago and tragically still relevant.