Over 800 employees and contractors working for Google signed a petition this week calling on the company to disclose and cancel any contracts it may have with US immigration authorities. In a statement, the workers said they are “vehemently opposed” to Google’s dealings with the Department of Homeland Security, which includes Immigration and Customs Enforcement (ICE) and Customs and Border Protection (CBP).

“We consider it our leadership's ethical and policy-bound responsibility to disclose all contracts and collaboration with CBP and ICE, and to divest from these partnerships,” the petition published on Friday states. Google didn’t immediately respond to a request for comment.

US immigration authorities have been under intense public scrutiny this year as the Trump administration ramped up its mass deportation campaign, sparking nationwide protests. In Minneapolis, confrontations between protesters and federal agents culminated in the fatal shooting of two US citizens by immigration officers. Both incidents were captured in widely disseminated videos and became a focal point of the backlash. In the wake of the uproar, the Trump administration and Congress say they are negotiating changes to ICE’s tactics.

Some of the Department of Homeland Security’s most lucrative contracts are for software and tech gear from a variety of different vendors. A small share of workers at some of those suppliers, including Google, Amazon, and Palantir, have raised concerns for years about whether the technology they are developing is being used for surveillance or to carry out violence.

In 2019, nearly 1,500 workers at Google