Blackmail, a wonderfully curious offense, is the favorite of clever criminal law theorists. It criminalizes the threat to do something that would not be criminal if one did it. There exists a rich literature on the issue, with many prominent legal scholars offering their accounts. Each theorist has his own explanation as to why the blackmail offense exists. Most theories seek to justify the position that blackmail is a moral wrong and claim to offer an account that reflects widely shared moral intuitions. But the theories make widely varying assertions about what those shared intuitions are, while also lacking any evidence to support the assertions. This Article summarizes the results of an empirical study designed to test the competing the...