Final answer:
Upton Sinclair's novel 'The Jungle' led to legislative reforms such as the Meat Inspection Act and Pure Food and Drug Act in 1906 which aimed to improve the cleanliness in the U.S. meatpacking industry and the safety of food and drugs.
Step-by-step explanation:
Upton Sinclair was responsible for major reforms in the meatpacking industry and broader consumer protections. His novel, 'The Jungle,' exposed unsanitary and inhumane conditions in the Chicago meat-packing industry. This led President Theodore Roosevelt to push for the passing of the Meat Inspection Act and the Pure Food and Drug Act in 1906, which improved food safety and required truth in labeling.