This great novel exposes the appalling, brutal exploitation of American workers. Upton Sinclair shows how the employer uses unemployment to keep wages low and conditions vile.
He also shows how the employer Durham used immigration to undermine the workers. "The Bohemians had come then, and after them the Poles. People said that old man Durham himself was responsible for these immigrations; he had sworn that he would fix the people of Packingtown so that they would never again call a strike on him, and so he had sent his agents into every city and village in Europe to spread the tale of the chances of work and high wages at the stockyards. The people had come in hordes; and old Durham had squeezed them tighter and tighter, speeding them up and grinding them to pieces, and sending for new ones. The Poles, who had come by tens of thousands, had been driven to the wall by the Lithuanians, and now the Lithuanians were giving way to the Slovaks."