Which of these writers helped bring about the breakup of the Standard Oil monopoly?

Ida Tarbell exposed Standard Oil’s unfair business practices in a series of investigative articles, later published as The History of the Standard Oil Company. Her reporting helped build public support for action against the monopoly, which the Supreme Court ordered broken up in 1911. Lincoln Steffens and Jacob Riis investigated other social and political problems, while Frank Norris wrote novels criticizing corporate power.

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