For years, Alex Karp, Palantir’s CEO, had declared the data-management company to be “involved in supporting progressive values,” saying he has repeatedly “walked away” from contracts that targeted minorities or that he found otherwise unethical. Even as Palantir took on extensive data-management contracts for the federal government, the company said it was not willing to allow its powerful tools to broadly track immigrants across America.

That commitment no longer holds. Palantir’s software is helping U.S. Immigration and Customs Enforcement track undocumented immigrants and deport them faster, according to federal procurement filings and interviews with people who have knowledge of the project and who spoke on the condition of anonymity to discuss sensitive details. The software, Immigr

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