At a hearing of the Senate Judiciary Committee last fall, Senator Chuck Grassley, Republican of Iowa, asked Attorney General Eric Holder to produce a list of Department of Justice employees who had been involved in representing detainees. Holder said he’d consider the request.Three months later he denied it. In a letter to Grassley on February 18, Holder acknowledged that nine Justice Department officials had worked on behalf of detainees before joining the Obama administration. The names of two of those officials—Jennifer Daskal and Neal Katyal—had been reported publicly. But Holder refused to disclose the other seven and allowed that...