Bombings, shootings, arson and a car-ramming: The past month appears to have been one of the most dangerous on record for Diaspora Jewish communities, amid a surge in attacks during the US-Israeli conflict with Iran. There were at least 14 incidents, attacks or plots that appeared to target Diaspora Jewish institutions in March, ranging across Europe to Canada and the US. The sum amounts to an incident every other day of the month. Jewish security officials have sounded the alarm repeatedly, saying the threat environment is at a high point, with a record number of calls for violence directed against...