Reza Pahlavi, Iran's exiled crown prince, has warned Iran's Supreme Leader Ayatollah Ali Khamenei of a Nuremberg-like Nazi trial as uneasy calm returned in Tehran after a wave of protests that drew a bloody crackdown. In an open letter to Khamenei, Pahlavi dubbed the clergy leader an anti-Iranian criminal whose hands are stained with the blood of tens of thousands of Iranians. The letter comes as the number of deaths in a crackdown by authorities that smothered the demonstrations reached at least 4,029, according to activists. Pahlavi's Letter "You, your regime, and all your mercenaries will be held accountable for...