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Standard Oil Co. of New Jersey v. United States
https://en.wikipedia.org/wiki/Standa..._United_States
Standard Oil Co. of New Jersey v. United States, 221 U.S. 1 (1911), was a case in which the Supreme Court of the United States found Standard Oil Co. of New Jersey guilty of monopolizing the petroleum industry through a series of abusive and anticompetitive actions.
The Court's remedy was to divide Standard Oil into several geographically separate and eventually competing firms.