Iran is emerging as the primary threat against the United States and its allies. Iran's drive to acquire nuclear weapons, continuing support for and involvement with terrorist networks, publicly-stated opposition to the Arab-Israel peace process, disruptive role in Iraq, expansionist radical ideology, and its denial of basic human rights to its own population are challenges confronting U.S. policymakers. In trying to solve the puzzle posed by Iran, Iran Policy Committee's report suggests that Iranian opposition groups play a central role in U.S. policymaking.