Following employee protests at Google and Microsoft over government contracts, workers at Amazon are circulating an internal letter to CEO Jeff Bezos, asking him to stop selling the company’s Rekognition facial recognition software to law enforcement and to boot the data-mining firm Palantir from its cloud services.

Amazon employees objected to the Trump administration’s “zero-tolerance” policy at the U.S. border, which has resulted in thousands of children being separated from their parents.