What was Upton Sinclair's novel The Jungle about? What did he intend it to reveal? And what shocked readers the most?

Upton Sinclair's The Jungle: Muckraking the Meat-Packing Industry. Upton Sinclair wrote The Jungle to expose the appalling working conditions in the meat-packing industry. His description of diseased, rotten, and contaminated meat shocked the public and led to new federal food safety laws.