Question

Who established Standard Oil Company, used trust to form a monopoly over the oil industry. "Robber baron"

Answer 1

John D. Rockefeller

Is the one who established the Standard Oil Company, used trust to form a monopoly over the oil industry. "Robber baron"
Standard Oil Co. Inc. was an American oil producing, transporting, refining, and marketing company.

Answer 2

John D Rockefeller would be the answer you're looking for :)