The Great Union Stock Yards, Chicago c. 1903

Upton Sinclair's 1906 book The Jungle was based on observations he made at Chicago's Union Stockyards in 1904. In September 1905 Sinclair wrote a letter to Clarence Darrow asking for legal advice about whether his book would subject him to libel charges. The stockyards were in operation from 1865 to 1971.
Library of Congress Prints and Photographs Division, LC-USZ62-51793