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Secret Agent
Disguised as a worker, Upton Sinclair spent seven weeks in the slaughterhouses ( Meatpacking industries ) in 1904.
It leaded everyone to finding out that the Meatpacking industries were unhealthy and unsafe. -
A great help
President Roosevelt launched an official government investigation into the meatpacking plant conditions in Chicago.
This was a good way to try to halt the bad conditions of the Meatpacking industries.