Over the past decade, the US Immigration and Customs Enforcement agency (Ice) has amassed millions of data points that it uses to identify and track its targets – from social media posts to location history and, most recently, tax information.

And there’s been one, multibillion-dollar tech company particularly instrumental in enabling Ice to put all that data to work: Palantir, the data analytics firm co-founded by Peter Thiel, the rightwing mega-donor and tech investor.

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“We’ve always known what the tools Palantir built are capable of. We now have the receipts for that,” said Jacinta González, one of the original organizers behind the No Tech for Ice campaign and the head of programs at digital rights non-profit MediaJustice.

The documents reveal how deeply embedded Palantir’s tools were in HSI’s day-to-day operations, helping its agents to investigate and arrest people using a searchable super-network of government and private databases.

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