Letter from Upton Sinclair to President Theodore Roosevelt, March 10, 1906, selected page.
In this letter to President Roosevelt, Sinclair supported the presence of federal inspectors in the meat-packing houses, but he advised that inspectors should come disguised as workingmen to discover the true conditions, as Sinclair did when he researched his book.
National Archives, Records of the Office of the Secretary of Agriculture
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The Emergence of Modern America (1890-1930)
American Originals 2