BOSTON (AP) — Over two decades, the United States and its allies spent hundreds of millions of dollars building databases for the Afghan people. The nobly stated goal: Promote law and order and government accountability and modernize a war-ravaged land.

But in the Taliban's lightning seizure of power, most of that digital apparatus — including biometrics for verifying identities — apparently fell into Taliban hands. Built with few data-protection safeguards, it risks becoming the high-tech jackboots of a surveillance state. As the Taliban get their governing feet, there are worries it will be...