What was true about meat packing plants in the story jungle?

In Upton Sinclair's novel "The Jungle," the meat packing plants were portrayed in a very negative light. The working conditions were described as extremely unsanitary and dangerous, and the workers were treated poorly. The meat itself was often processed in ways that made it unsafe for consumption. Sinclair's expose of the meat packing industry led to public outrage and eventually to the passage of the Pure Food and Drug Act of 1906.