Goldstone banned from grandson's Bar Mitzva

Judaism has a concept of excommunication which is known as cherem. Although developed from the Biblical ban, excommunication, as employed by the Rabbis during Talmudic times and during the Middle Ages, it became a rabbinic institution, the object of which was to preserve Jewish solidarity. A system of laws was gradually developed by Rabbis, by means of which this power was limited, so that it