The head of Documenta, one of Germany’s most renowned exhibitions of modern art, resigned on Saturday amid an anti-Semitism scandal. The shareholders and supervisory board mutually agreed to terminate Sabine Schormann’s contract at short notice, a statement from the organization said. The Kessel-based institution said it would appoint an interim successor. Last month, under pressure, the exhibition removed a mural by an Indonesian art collective that features a soldier-like figure depicted as a pig wearing a scarf with a Star of David and a helmet bearing the word “Mossad” — the name of Israel’s national intelligence agency. Schormann had originally...