Anti-government demonstrations erupted Saturday in several locations across Iran as the most sustained protests in years against a deeply entrenched theocracy entered their fourth week. At least two people were killed. Marchers chanted anti-government slogans and twirled headscarves in repudiation of coercive religious dress codes. In some areas, merchants shuttered shops in response to a call by activists for a commercial strike or to protect their wares from damage. The protests erupted in Septeber, after the burial of 22-year-old Mahsa Amini, a Kurdish woman who had died in the custody of I…