On April 10, 2006, John Lott filed suit for defamation against Steven Levitt and HarperCollins Publishers over the book "Freakonomics" and against Levitt over a series of emails to retired economist John B. McCall. In the book "Freakonomics", Levitt and coauthor Stephen J. Dubner argued that the results of Lott's research in "More Guns, Less Crime" had not been replicated by other academics. In the emails to McCall, who had pointed to a number of papers in different academic publications that had replicated Lott's work, Levitt wrote that the work by authors supporting Lott in a special 2001 issue of the "Journal of Law and Economics" had not been peer reviewed, alleged that Lott had paid the University of Chicago Press to publish the papers, and that papers with results opposite of Lott's had been blocked from publication in that issue.