On Monday, April 18, legislators' offices will be visited by individuals associated with a group unknown to most lawmakers: The United States Council of Muslim Organizations (USCMO). In the interest of helping members of the U.S. Congress understand precisely who their interlocutors are, permit a brief introduction: The USCMO is the latest in a long series of front organizations associated with, and working to advance, the agenda of the Muslim Brotherhood in the United States.