The heirs of a Jewish couple who fled Germany in the 1930s are suing the Metropolitan Museum of Art in New York and a Greek art foundation over a van Gogh oil painting they say was looted by the Nazis. The Met purchased Vincent van Gogh’s 1889 'Olive Picking' for $125,000 (€108,000) in 1956 and sold it to a Greek magnate in 1972. The lawsuit, which was first reported by the New York Times, argues the American museum “knew or should have known that the painting had probably been looted by Nazis.”