Upton Sinclair was an American author and journalist who wrote over 90 books and other works in several genres. He is best known for his 1906 novel The Jungle, which exposed labor and sanitary conditions in the U.S. meatpacking industry. He was a prolific writer of fiction and non-fiction, and also wrote plays and poetry. His work often focused on social and political issues, such as poverty, labor rights, and socialism.