Unlawful denial of or discrimination in membership or participation in service or organization relating to selling or renting dwellings

It shall be unlawful to deny any person access to or membership or participation in any multiple-listing service, real estate brokers' organization, or other service, organization, or facility relating to the business of selling or renting dwellings or to discriminate against such person in the terms or conditions of such access, membership, or participation on account of race, color, religion, sex, disability, familial status, or national origin.