What does reform have to do with "The Jungle" by Upton Sinclair?

This book was one which showed how bad conditions were in the meat-packing industry in Chicago.  Even though the book was fictional, the bad things it portrayed were real enough that it made people very upset.

In large part because of this book, Congress got involved in reforming the food industry.  One of the major things that this involvement led to was a new law called the Pure Food and Drug Act.

Upton Sinclair, along with other muckrakers, was given credit for inspiring this and other reforms of the Progressive Era.