In the latest escalation of the Trump administration’s war on the left, the U.S. government’s designation of a popular antifascist webhosting provider as a terror group could shutter a swath of radical websites in the U.S.

Secretary of State Marco Rubio and Treasury Secretary Scott Bessent announced Wednesday that they were targeting the Italy-based A/I Collective with terror sanctions. Federal law gives the Treasury Department broad discretion to apply the terror label to foreign groups.

A wide array of anarchist, antifascist, and far-left groups in the U.S. and abroad use the privacy-minded collective’s offerings, including an anonymous email service and its popular noblogs.org blogging platform.

The practice of designating an internet platform and service provider as a terror group — rather than those pursuing violence themselves — has “huge” implications for the future free speech on the internet, warned Jillian York, the director of international freedom of expression at the Electronic Frontier Foundation.

“They are going after the messenger,” York said. “I don’t think that the members of the group would necessarily condone the actions of the people that they hosted. What they do condone is the freedom to host, the ability to be anonymous, the ability to be private.”