Guy Wildenstein, with Monet's "Villas at Bordighera" (1884), at the Wildenstein & Company gallery in New York in 2007. Mr. Wildenstein has been called for questioning by French fraud investigators. PARIS — On a mild day in January, French police investigators poured into the regal Right Bank building of an art research center called the Wildenstein Institute and began sifting through a substantial trove of artworks there. Enlarge This Image A painting by Berthe Morisot that was confiscated from the Wildenstein Institute in Paris by the French police along with armloads of other artworks that are alleged to have been missing or stolen. It was the third police raid on the institute, and at the end of it the investigators carried away armloads of art, including Degas drawings, a bronze sculpture by Rembrandt Bugatti and an Impressionist painting of a Normandy cottage by Berthe Morisot. All had been reported missing or stolen, some by Jewish families whose property ...