"American Constitutional Law... final chapter... "The Problem of State Action," grappled with one of the most perplexing aspects in the law of the U.S. Constitution: its character as a body of law addressing not ordinary private conduct but only government conduct. ...[T]he law of the Constitution is a kind of meta-law. ...many instances of what might be regarded as government inaction pose troubling constitutional questions. ...[T]he Supreme Court has generally interpreted constitutional provisions as having nothing at all to say about non-governmental choices. ...One might ...say that the constitutional principle limiting the Constitution’s reach to "state action" is an unwritten command ...essentially "heard" in the sounds of constitutional silence. ...I closed the book with the question: "[I]s it not fitting that a book about the Constitution should close by studying what the Constitution is not about?""