The United States Justice Department has warned Apple and five of the largest U.S. publishers that it plans to file an anti-trust suit against them. Citing people familiar with the matter, the Wall Street Journal reports that the suit will accuse Apple, Simon & Schuster, Hachette Book Group, Penguin Group, Macmillan, and HarperCollins of colluding to raise the price of electronic books. Several of the parties have held talks to settle the caseā¦