Jay, I have heard of
http://chargebackbureau.org/ and
http://www.vindicia.com/ before. I do not think that we should immediately think "fraud" if there were chargebacks associated with a particular domain. With some hosting providers not delivering good service, and the growing number of those outlets, I see more often people who have a number of negative experiences.
As far as fighting fraud, most established merchant account providers include fraud screening with their services, that should be the most basic protection level. I think it gets trickier when service is rejected based on third-party information about how many chargebacks the domain had. Not sure what would classify discrimination in this case, if at all.
Best,