ISTANBUL, June 20 -- When French riot police stormed the suburban Paris headquarters of the People's Mujaheddin earlier this week, the Iranian dissident group put up little resistance. Officers seized satellite phones and $1.3 million in cash, and detained 159 people, including the wife of the group's leader. But in days following the arrest, members retaliated with self-immolations. One after the other, nine people set themselves on fire, often as TV cameras rolled, to protest the continued holding of Maryam Rajavi. One of them died, others were severely burned. The group shrank during exile into an isolated band of a...