The case originated with Socony-Vacuum's practices of organizing a cartel among the "major" oil companies in which they bought oil—known as "hot oil"—from independent producers and stored the surplus in tanks to limit the supply of oil available on the market and keep the price of oil artificially high. In its decision, the U.S. Supreme Court ruled that regardless of the purpose of the price fixing or if the prices varied, such conduct was illegal in and of itself: "Under the Sherman Act a combination formed for the purpose and with the effect of raising, depressing, fixing, pegging, or stabilizing the price of a commodity in interstate or foreign commerce is illegal per se..." This rule remains in use today for agreements that appear on their face to always or almost always restrict competition and reduce output.