Zohran Mamdani’s victory speech in the New York mayoral race was carried live on Israeli television and radio, a sign of the deep concern in the Jewish state about the next leader of the city with the world’s largest population of Jews. “The Big Apple has fallen,” Avigdor Liberman, the leader of a right-wing opposition party and former foreign minister, said through a spokesman. He urged “New York Jews who want to survive” to emigrate “to where they belong — the land of Israel.” Danny Danon, the Israeli ambassador to the United Nations, was more sober, vowing in a post...