The Authors Guild, along with five other writers’ groups and the nonprofit Open Markets Institute, has sent a letter to the Department of Justice asking the government to block Penguin Random House’s pending acquisition of Simon & Schuster. “The time has also come to recognize that simply blocking takeovers is no longer sufficient,” the letter states. “The Department of Justice must begin today to proactively restructure the entire U.S market for books in ways that also deal with the danger posed by Amazon.”