Former employees of OpenAI and Google DeepMind published an open letter asking AI companies to allow employees to raise concerns about technology risks without fear of retaliation. The letter, signed by 13 people, including anonymously due to fear of repercussions, argues that AI risks include worsening inequality, manipulation, and autonomous system control loss resulting in human extinction. Companies have substantial non-public information about systems' capabilities, limitations, and risks but minimal obligations to share with governments or the public. The group requests not enforcing criticism bans, an anonymous employee risk concern process, supporting an open criticism culture, and not retaliating against information sharing after other avenues fail.