Palantir is one of the most significant and secretive companies in big data analysis. The company acts as an information management service for Immigrations and Customs Enforcement, corporations like JP Morgan and Airbus, and dozens of other local, state, and federal agencies. It’s been described by scholars as a “secondary surveillance network,” since it extensively catalogs and maps interpersonal relationships between individuals, even those who aren’t suspected of a crime.

Palantir software is instrumental to the operations of ICE, which is planning one of the largest-ever targeted immigration enforcement raids this weekend on thousands of undocumented families. Activists argue raids of this scale would be impossible without software like Palantir. But few people outside the company and its customers know how its software works or what its specific capabilities and user interfaces are.

Through a public record request, Motherboard has obtained a user manual that gives unprecedented insight into Palantir Gotham (Palantir’s other services, Palantir Foundry, is an enterprise data platform), which is used by law enforcement agencies like the Northern California Regional Intelligence Center.

Read more on Vice.