This chapter examines Justice Antonin Scalia’s views on Article III of the U.S. Constitution and the nature of the federal judicial power that it established. One of Scalia’s principal goals was to limit severely the power of the federal courts and to undo many of the decisions of the Warren Court, including their ability to create implied private causes of action, and the chapter argues that in pursuing that goal Scalia departed from originalist views and that the arguments he advanced were themselves self-contradictory. The chapter shows, moreover, that originalist doctrines and historical practices actually contradicted his claims about limits on the federal judicial power. Further, the chapter argues that his views were based not on originalist ideas but on the twentieth-century positivism associated with Erie Railroad v. Tompkins, and that in Sosa v. Alvarez-Machain, he explicitly acknowledged that his positivist ideas were not the ideas of the Founders. The chapter concludes that in this area, Scalia simply abandoned originalism and did so, once again, to achieve his own ideological and political goals