In 2007 Christopher Chippindale and I published a study of the antiquities returned from the J. Paul Getty Museum to Italy. We observed that among the dealers and galleries that supplied the material were two members of the International Association of Dealers in Ancient Art (IADAA). One of the two was the Galerie Nefer that we noted had "recently resigned from the organization" (sc. IADAA). Galerie Nefer, Zurich, was owned by Frida Tchacos; her husband, Werner Nussberger, had donated fragments of pots that were returned to Italy (see comments).
Now another gallery appears to have "resigned" from the IADAA. Why? What is the stated reason?
Gill, D. W. J., and C. Chippindale. 2007. "From Malibu to Rome: further developments on the return of antiquities." International Journal of Cultural Property 14: 205-40. [Abstract and link]