What notable book did Upton Sinclair write that revealed the harsh realities of the meatpacking industry?

Upton Sinclair wrote "The Jungle," which is a significant work that brought to light the dire conditions within the meatpacking industry in the early 20th century. Published in 1906, the book vividly describes the unsanitary practices, worker exploitation, and the general hardships faced by laborers in Chicago's meatpacking plants. Sinclair aimed to promote socialism, but many readers were shocked by the graphic depictions of food production and the treatment of workers, leading to public outcry and ultimately prompting reform in food safety regulations. The novel had a profound impact, contributing to the passage of the Pure Food and Drug Act and the Meat Inspection Act in 1906, marking a pivotal moment in American social and economic history.