On Sunday, a letter denouncing Amazon’s tactics in the ongoing negotiations between it and book publisher Hachette ran as a paid, full-page advertisement in the New York Times. Signed by more than 900 authors, the “Authors United” letter calls Amazon out for blocking sales of Hachette titles, singling out authors “for selective retaliation” and “inconveniencing and misleading its own customers with unfair pricing and delayed delivery.” The letter, overseen by thriller author Douglas Preston, who has been a vocal opponent of Amazon throughout the negotiations, was signed by traditionally published authors including Stephen King, Lee Child, Anna Quindlen, Barbara Kingsolver, Meg Wolitzer, John Grisham and Malcolm Gladwell, among hundreds of others. The letter suggests that readers “email Jeff Bezos, CEO and founder of Amazon, at jeff@amazon.com, and tell him what you think.”