Details the threat the American public faces from Iran's Revolutionary Guard, also known as the Islamic Revolutionary Guard Corps (IRGC), whose reach extends from the Middle East to Latin America and beyond; Documents that members of its proxy, Hezbollah, and covert IRGC officers prowl the streets of American cities, surveilling targets and planning terrorist attacks; Outlines the IRGC's efforts to acquire nuclear weapons, with which it aims to threaten the United States directly