The Justice Department has sued TikTok for violating children’s privacy and breaching an agreement it made with the Federal Trade Commission years ago to stop collecting the data of kids under 13 without their parents’ knowledge or permission.

“This action is necessary to prevent the defendants, who are repeat offenders and operate on a massive scale, from collecting and using young children’s private information without any parental consent or control,” Brian Boynton, head of the Justice Department’s Civil Division, said in a statement Friday.