The southern Iranian port town of Assaluyeh, where workers have blocked roads and protested. Workers at a petrochemical complex in southern Iran went on strike Monday, the latest sign that antigovernment protests now in the fourth week are broadening to critical sectors of the economy. Dozens of workers blocked roads and protested at a plant in Assaluyeh in the oil-rich province of Bushehr on the Persian Gulf, chanting “Do not fear. We stand together” and “Death to the dictator,” according to social-media posts.