May 5, the day that changed Aliakbar and Shahla Afshari's lives, began like most others. They shared coffee, dropped their 12-year-old son off at Cheat Lake Middle School here, then drove to their laboratories at the National Institute for Occupational Safety and Health, a federal agency that studies workplace hazards.
But that afternoon, their managers pulled the Afsharis aside and delivered a stunning message: they had failed secret background checks and were being fired. No explanations were offered and no appeals allowed. They were escorted to the door and told not to return.
Mrs. Afshari, a woman not prone to emotional flourishes, says she stood in the parking lot and wept. "I just wanted to know why," she said.
Seven months later, the Afsharis, Shiite Muslims who came from Iran 18 years ago to study, then stayed to build careers and raise three children, still have no answers.
They have been told they were fired for national security reasons that remain secret. When their lawyer requested the documents used to justify the action, he was told none existed. When he asked for copies of the agency's policies relating to the background checks, he received a generic personnel handbook.
Without any official explanations of why they failed their background checks, they came up with their own theory: their attendance, more than five years ago, at two conventions of a Persian student association that has come under F.B.I. scrutiny, once with a man who was later investigated by the bureau.
The Afsharis' case comes at time when immigrants from many nations, but particularly Islamic ones, are facing tougher scrutiny from government agencies.
Unable to clear their names or find new employment in their field, the Afsharis on Thursday resorted to that most American of recourses: they sued the institute and its parent agencies, the Centers for Disease Control and Prevention and the Department of Health and Human Services, demanding back pay and reinstatement or the chance to appeal.
