Walter Block is one of my favorite free-market oriented scholars. He is the author, most notably, of a sparklingly iconoclastic book called Defending the Undefendable , the various chapters of which say positive things about: pimps, drug pushers, drug addicts, blackmailers, ticket scalpers, and dishonest cops! The argument in favor of legalizing blackmail has been especially influential: not because there has been any groundswell of support for such a policy change but because the academic reception of that chapter has shown that Block hit a nerve, among free market advocates. Block's case for legalizing blackmail drew responses in particular from Robert Nozick, Richard Posner, Richard Epstein, and James Lindgren, an honor role of libertarian theorists. Each gave his reasons why he was unpersuaded. Block has responded. Note that blackmail (for purposes of this debate) is different from extortion. Blackmail is the threat to do something you would otherwi...