Upton Beale Sinclair, Jr. (1878-1968), American novelist and political writer, was one of the most influential muckraking writers of the 1900s. He continued to write and speak for reform for many years.

Upton Sinclair was born in Baltimore, Maryland, on September 20, 1878. His father, struggling against poverty and liquor, moved the family to New York City when Upton was 10. At 14 Upton entered the College of the City of New York. He graduated in 1897 and went to Columbia University to study law. Through these years he supported himself by writing for adventure-story magazines.

Sinclair moved to Quebec in 1900. His first novel, Springtime and Harvest (1901), was a modest success. Three more novels in the next 4 years failed to provide even a bare living. In 1906, however, The Jungle, exposing unfair labor practices and unsanitary conditions in the packing houses of Chicago, scored a huge success. The novel's protest about the lot of...