I have made no secret of my distaste for big oil. So, now, I will build a case why it would not only be beneficial for society to break them up, but, under Sherman Anti Trust it is perfectly legal. Here is the relevant portion. The Sherman Antitrust Act (Sherman Act,[1] July 2, 1890, ch. 647, 26 Stat. 209, 15 U.S.C. § 1–7) was the first United States Federal statute to limit cartels and monopolies. It falls under antitrust law.