Answer :
Sinclair intended the book to raise public consciousness about the plight of the working poor, but he relied on a pseudo-naturalistic technique that emphasized the physically revolting filth and gore of the stockyards. Thank you for posting your question here. I hope the answer helps.
In his book, Sinclair wrote about the harsh working conditions endured by the immigrants in the cities like Chicago and other smaller industrial cities. In an order to show the readers about the horror these people face while working in the fertilizer plant, he used the following three images:
1. The throbbing veins in the forehead of the workers.
2. Children, women, and men sawing the bones.
3. Dusty and suffocating working cellars.