DES MOINES, Iowa [KCCI] — Penguin Random House Publishing is suing the state of Iowa over a law passed last year banning books that contain content about sexual depictions and gender identity or orientation in schools. Now, five more major book publishers are planning to join the lawsuit. The law was blocked from taking effect as the lawsuit moves through the courts.

The publishers set to join the lawsuit include Hatchette Book Group, HarperCollins, Macmillan, Simon & Schuster and Sourcebooks. They have not yet filed to join.

High-profile authors, Iowa educators and a high school student have already joined Penguin Random House in the lawsuit.