Upton Sinclair's The Jungle had already caused public outrage over the safety of processed meat, so by the 1920s, the general public had come to expect a clean and hygienic hamburger.
Delo The Jungle Aptona Sinklera već je izazvalo javni bes po pitanju sigurnosti procesiranog mesa, tako da je do 1920-ih opšta javnost morala da očekuje čist i higijenski hamburger.