Upton Sinclair
He wrote many other books.  His book The Flivver King was about the Ford Motor Company.  The Flivver King was written at the time when workers at Ford factories were trying to start a labor union.  He wrote a series (many books in a row) with Lanny Budd as the main character.  There were eleven (11) Lanny Budd books.  The Lanny Budd books were about current events in the World at the time.