What did ida m. tarbell's investigations reveal?

Ida Tarbell was an American journalist, considered one of the main "muckrakers" of the Progressive Era of the late nineteenth and early twentieth centuries.

She is known for her research on John D. Rockefeller and the Standard Oil Company, published in series by McClure's Magazine from 1902 to 1904; her investigations exposed the unfair monopolistic practices carried out by the company until the Supreme Court of the United States decided to dissolve the monopoly.

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