In honor of Banned Books Week, here’s a letter to President Theodore Roosevelt from Upton Sinclair, whose novel “The Jungle” has been banned in banned in Yugoslavia, East Germany, South Korea, and Boston.

In this letter, Sinclair wrote to President Roosevelt, supported the presence of federal inspectors in the meat-packing houses.

He advised that inspectors should come disguised as workingmen to discover the true conditions, as Sinclair did when he researched his book “The Jungle.”