A sharp letter from the Gahoak (הגה"ק), the author of the Divrei Yechezkel of Shiniva, zy"a (זיע"א).A chiddush (חידוש) regarding the issur (איסור) of the Cherem d'Rabbeinu Gershom Me'or HaGolah (חרם דרבינו גרשום מאור הגולה).The letter was sent to the Gaha