The United States has used economic sanctions targeting the energy sector that is so vital to Iran’s economy with varying degrees of intensity since the Iran Hostage Crisis of 1979. By and large, the sanctions did not have their intended effect. By 2010, Iran was the foremost state-sponsor of terrorism and was on the brink of acquiring the capability to develop nuclear weapons—a phenomenon that could have cataclysmic repercussions for American interests in the Middle East and beyond. In July 2010, Congress passed and President Obama signed the Comprehensive Iran Sanctions, Accountability, and Divestment Act of 2010, in an effort to use the most drastic sanctions measures yet to finally change the course of Iran’s behavior. This Commen...