Upton Sinclair's "The Jungle" primarily exposed issues related to which industry?

Upton Sinclair's "The Jungle" primarily exposed issues in the meatpacking industry. The novel, published in 1906, focused on the harsh conditions faced by workers in the Chicago meatpacking plants and highlighted the unsanitary practices that were prevalent at the time. Sinclair intended to shed light on the exploitation of immigrant laborers, but the graphic descriptions of the unsanitary conditions in the slaughterhouses led to public outrage and ultimately prompted significant reforms in food safety regulations. This included the passage of the Pure Food and Drug Act and the Meat Inspection Act in 1906. Sinclair’s work was pivotal in raising awareness about food safety and labor rights, making the meatpacking industry the focal point of his criticism.