The Jungle was by Sinclair, who was known as a "muckraker" in the Progressive Era, which meant that he brought to light all the muck of society.
It's a really depressing novel that focuses on Jurgis Rutkus, an immigrant who works at a deplorably unclean facility that packages meat, so that covers both i and ii.
The Pure Food and Drug Act and the Meat Inspection Act were both passed as a result of this! Good job, Sinclair!
