The Iron Heel, considered to be one of the earliest modern dystopian novels, demonstrated London's prophetic sense for how Fascism regimes arise. It supposedly influenced George Orwell's writing of 1984.
Jack London. The Iron Heel. (1907) ebook (New York: Macmillan Publishing Co, 1907) 2006. http://www.gutenberg.org/catalog/world/readfile?fk_files=3063724