‘From the river to the sea, Palestine will be free,” runs a Palestinian slogan. Originally a call for a secular state in historic Palestine between the river Jordan and the Mediterranean, it soon became a sectarian slogan, deeply inflected by antisemitism. In the hands of Hamas, it is a call for the driving out of all Jews from the region; at best, a demand for ethnic cleansing, at worst for genocide. The founding charter of Likud, Israel’s...