<P> Standard Oil Co. Inc. was an American oil producing , transporting , refining , and marketing company . Established in 1870 by John D. Rockefeller and Henry Flagler as a corporation in Ohio , it was the largest oil refinery in the world of its time . Its controversial history as one of the world 's first and largest multinational corporations ended in 1911 , when the United States Supreme Court ruled that Standard Oil was an illegal monopoly . </P>
who helped bring about the breakup of the standard oil monopoly
the United States Supreme Court