The JungleBy: Upton Sinclair One of the most powerful, provocative and enduring novels to expose social injustice ever published in the United States, Upton Sinclair's The Jungle contains an introduction by Ronald Gottesman in Penguin Classics. Upton Sinclair's dramatic and deeply moving story exposed the brutal conditions in the Chicago stockyards at the turn of the nineteenth century and brought into sharp moral focus the appalling odds against which