Upton Sinclair, he wrote a book called "The Jungle". The book was about the meat packing industry's in Chicago. What would the city of Chicago's meat industry be like without Upton Sinclair? The book described what the meat industry's were putting in the meat that the people of Chicago ate back in the early 1900's. Upton Sinclair was a muckraker in the 1900's, this period of time (the 1900's). Upton Sinclair and The Jungle made a positive impact on the city of Chicago. Sinclair lobbied for meat packing legislation. In the process "He encourage ....