The Case of Curt Glasser

See, "Prestige Boston Art Museums Will Not Return Objets d'Art Once-Owned by German Collector Curt Glaser":

More than a dozen institutions and collectors have concluded that Curt Glaser sold his art collection in 1933 as a result of Nazi persecution. But the Metropolitan Museum of Art and the Museum of Fine Arts, Boston have rejected his heirs’ claims.

Read the whole thing at the link.