The legal heirs of a German Jewish banker who was forced to sell his art collection to avoid persecution by the Nazis are suing a Japanese holding company to reclaim ownership of a painting by Vincent van Gogh. Three heirs of Paul von Mendelssohn-Bartholdy, based in New York and Germany, filed a lawsuit on December 13 in an Illinois district court against Sompo Holdings, an insurance company based in Japan, to dispute its legal title to the painting Sunflowers (1888). The claim states that Mendelssohn-Bartholdy was a “casualty” of Nazi-era policies and economic sanctions that forced him to sell his...