“The Muslim Brotherhood,” the late historian Barry Rubin once remarked, “is by far the most successful Islamist group in the world.” But nearly a century after its creation, and decades after it spawned dozens of terrorist organizations, the Brotherhood isn’t designated as a terrorist group by the United States. Now, some in Congress are trying to change that.

On June 10, Rep. Nancy Mace (R-SC) introduced legislation to designate the Muslim Brotherhood as a foreign terrorist organization, or FTO. The Muslim Brotherhood Is a Terrorist Organization Act calls for the secretary of state to list the group as an FTO under Section 219 of the Immigration and Nationality Act. Mace’s office said the legislation would enable financial sanctions, asset freezes, travel bans, and targeted law enforcement to “dismantle the group’s operations in the U.S. and abroad.”