Which legislation is most closely associated with the work of Ida Tarbell?

The legislation that most closely matches the work of Ida Tarbell is the Sherman Anti-Trust Act of 1890. This law was introduced to prevent the formation and operation of monopolies in the oil industry. It is believed that Tarbell's story, The History of the Standard Oil Company, contributed to the collapse of Standard Oil, which happened when the US Supreme Court ruled that the company in question was violating the Sherman Anti-Trust Act.