Who is Upton Sinclair? What contributions did he make to the Progressive Movement?

Upton Sinclair wrote The Jungle, a book meant 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. Before the turn of the 20th century, a major reform movement had emerged in the United States. The book caused a public uproar that contributed in part to the passage a few months later of the 1906 Pure Food and Drug Act and the Meat Inspection Act.