What is the authors purpose for writing The Jungle Book?

The Jungle was written in 1906 by Upton Sinclair. In an attempt to raise "social awareness" it contrasts the corruption of the meat-packing industry with the appalling conditions and day-to-day hopelessness the "lower classes" work and live in. Upon publication, (after 5 rejections) the Jungle became an instant best seller and has never gone out of print.