‘Nazi-looted art,’ or a classic work of modernism? The heirs of a painter are suing the Philadelphia Museum of Art over ownership. PHILADELPHIA — Representatives of the artist’s heirs have labeled a masterpiece of modernist art in the Philadelphia Museum of Art’s collection as “Nazi-looted art,” despite the fact that the artist never objected during his lifetime. The painting, “Composition with Blue,” was purchased by renowned collector AE Gallatin in 1939 from the Buchholz Gallery in New York, a Nazi-favored sales outlet. According to museum officials, Gallatin exhibited the work in his famed Gallery of Living Art at New York...