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In 1906, Upton Sinclair came out with his book The Jungle, and it shocked the nation by documenting the horror of the meat-packing industry. People were being boiled in vats and sent to larders. Rat waste was mixed with meat. And so on.
As a result, the Federal Meat Inspection Act passed Congress, and consumers were saved from ghastly diseases. The lesson is that government is essential to stop enterprise from poisoning us with its food.