The American Civil Liberties Union of Illinois is suing a facial recognition aggregator capable of scraping billions of publicly available faces and matching them to search queries from law enforcement.

The lawsuit the ACLU filed in Cook County Court Thursday alleges Clearview AI secretly takes the visual data of subjects from places like Facebook, Twitter and other online sources that give a clear vision of a subject’s face, then makes the data available to law enforcement to reference, a violation of Illinois’ Biometric Information Privacy Act.