X, the social media platform owned by Elon Musk, is potentially violating U.S. sanctions by accepting payments for subscription accounts from terrorist organizations and other groups barred from doing business in the country, according to a new report.

The report, by the Tech Transparency Project, a nonprofit focused on accountability for large technology companies, shows that X, formerly known as Twitter, has taken payments from accounts that include Hezbollah leaders, Houthi groups, and state-run media outlets in Iran and Russia. The subscriptions, which cost $8 a month, offer users a blue check mark — once limited to verified users like celebrities — and better promotion by X’s algorithm, among other perks.