Corrupt politicians in several major American cities were voted out of office.
PETA aka People for the Ethical Treatment of Animals
Upton Sinclair's book The Jungle resulted in the creation of the 1906 Meat Inspection Act and the Pure Food and Drug Act.
progressive movement
Upton Sinclair's "The Jungle" was a revolutionary book. In it, Sinclair talked about the horrendous conditions for workers, and of the food, in a meatpacking plant. It is because of this book that the US has food safety standards and OSHA monitored workplaces.
The federal government authorized inspectors to visit all food plants
Upton Sinclair.
Upton Sinclair is the author of the 1906 novel The Jungle
Upton Sinclair's novel, "The Jungle" exposed unsanitary conditions in meat processing. At first, his novel was condemned as "lies". The President ordered investigations, which proved Sinclair was right. So, his novel led to the passage of The Pure Food and Drug Act and the Meat Inspection Act. These were signed into law on June 30th, 1906.
The American novelist Upton Sinclair
The Jungle, by Upton Sinclair, was about working conditions in the meatpacking industry.
The Meat Inspection Act
Maybe the Jungle by Upton Sinclair