US Secretary of State Marco Rubio announced Thursday a new visa restriction policy barring foreign nationals affiliated with what the administration describes as “far-left terrorist” organizations from entering the US.

The policy targets foreign nationals who have engaged in or materially supported acts of terrorism, violent crime, economic sabotage, or assisted far-left networks with any of these acts. It was issued under Section 212(a)(3)(C) of the Immigration and Nationality Act, which authorizes the Secretary of State to deny entry to foreign nationals he reasonably believes can have “potentially serious adverse foreign policy consequences” for the US.

In the State Department’s press release announcing the policy, Rubio described far-left terrorist groups as using “sophisticated, organized networks to perpetrate violence as a political tool,” employing “bombings, assassinations, and other forms of terrorism to silence speech, limit political opposition, change policy outcomes, and sabotage political processes.”

The State Department said the policy is being implemented in support of National Security Presidential Memorandum-7, which directed federal agencies to investigate and disrupt networks engaged in domestic terrorism and organized political violence, and part of a broader effort to disrupt these far-left networks before further escalation.