Some of the nation’s wealthiest and most powerful law firms have donated hundreds of millions of dollars in free legal services to terror suspects at the Guantanamo Bay prison. Their work, bolstered by left-wing activists groups, has helped to free, or force the transfer, of hundreds of al Qaeda suspects to third countries. Some have gone back to terrorism and the job of trying to kill Americans. The work of big American law firms on behalf of al Qaeda is drawing new attention since Attorney General Eric Holder decided this month that Khalid Sheik Mohammed, who orchestrated the murder of...