U.S. regulators are suing to block a $2.2 billion book publishing deal that would have reshaped the industry, saying consolidation would hurt authors and readers.German media giant Bertelsmann's Penguin Random House, already the largest American publisher, wants to buy New York-based Simon & Schuster, whose authors include Stephen King, Hillary Clinton and John Irving, from TV and film company ViacomCBS.The Department of Justice filed an antitrust suit in the U.S.