Former Iranian diplomat and senior regime official Mohammad Jaffar Mahallati, now a professor of religion at Oberlin College, stands accused of helping to cover up a mass murder of Iranian dissidents in the late 1980s. Despite his continuing ties to the regime and Hezbollah, he remains securely employed at the college, which maintains radio silence. Is Mahallati unique? What should be done? How to spur Washington to take a closer look at Iranian operatives?