Amazon workers have written to CEO Jeff Bezos in protest of the company selling facial recognition tools and other technology to police departments and government agencies. The workers cite the use of Amazon technology by the US Department of Homeland Security and the Immigration and Customs Enforcement (ICE) agency, which have been criticised for enforcing President Donald Trump's "zero tolerance" policy that has seen parents separated from their children at the US border. "As ethically concerned Amazonians, we demand a choice in what we build, and a say in how it is used. We learn from history, and we understand how IBM's systems were employed in the 1940s to help Hitler," the letter states. "IBM did not take responsibility then, and by the time their role was understood, it was too late. We will not let that happen again. The time to act is now."