A visitor views the Impressionist painting "Rue St.-Honore, Apres-Midi, Effet de Pluie," painted in 1897 by Camille Pissarro, in 2015 at the Thyssen-Bornemisza Museum in Madrid. Matriana Eliano/Associated Press A unanimous U.S. Supreme Court ruling Thursday could enable a California man to reclaim a valuable Impressionist painting that was stolen by the Nazis from the man's great-grandmother in 1939 and acquired by a Spanish government museum 54 years later. The 1897 painting by Camille Pissarro, “Rue St. Honorè in the afternoon, effect of rain,” shows a rainy street in Paris. The court did not resolve its ownership but overturned rulings...