Upton Sinclair, Jr. (September 20, 1878 – November 25, 1968), was a Pulitzer Prize-winning prolific American author who wrote over 90 books in many genres. He achieved considerable popularity in the first half of the 20th century, gaining particular fame for his 1906 muckraking novel The Jungle. The book dealt with conditions in the U.S. meat packing industry, causing a public uproar that partly contributed to the passage of the Pure Food and Drug Act and the Meat Inspection Act in 1906 Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.