William Mellor and Robert Levy talked about their book, The Dirty Dozen: How Twelve Supreme Court Cases Radically Expanded Government and Eroded Freedom (Sentinel; May 1, 2008). In the book they tell the story of twelve little-known U.S. Supreme Court cases that altered the course of American history. They argue that most of these rulings resulted in expansions of the role of federal government at the expense of individual rights. They talked about their book and some of the cases, including Helvering v. Davis (1937), Wickard v. Filburn (1942), and Kelo v. City of New London (2005). The authors also responded to questions from members of the audience at the Harvard Club of New York City. Robert Levy is a senior fellow in constitutional studies at the Cato Institute in Washington, DC. He has written for the New York Times, Wall Street Journal, and Washington Post. William Mellor is the president and general counsel of the Institute of Justice. He litigates constitutional cases involving economic liberty, property rights, school choice, and free speech.