Palantir, founded by Peter Thiel (currently funding JD Vance), is building a vast person database [1].
I believe their biggest customer is the US government, and is being used by ICE [2].
1: https://beyondthefirewall.substack.com/p/palantirs-new-maste...
2: https://www.404media.co/leaked-palantirs-plan-to-help-ice-de...