Seven works by the Austrian Expressionist Egon Schiele will be handed over on Wednesday to the heirs of the Viennese cabaret artist who had owned them before he was murdered by the Nazis, according to Manhattan prosecutors, marking a major turning point in one of the art world’s longest-running Holocaust restitution cases. The ceremony to return the artworks to the heirs of Fritz Grünbaum, who was killed in the Dachau concentration camp in 1941, was scheduled to be held at the office of the Manhattan district attorney, Alvin L. Bragg, which investigated the case. “This is of huge importance in...