Final answer:
Under the federal Fair Housing Act, real estate organizations are prohibited from refusing to negotiate with individuals in protected groups, providing different terms or conditions for housing, or advertising properties only to specific groups.
Step-by-step explanation:
Under the federal Fair Housing Act, real estate organizations, such as multiple listing services, may not refuse to negotiate with someone in a protected group, provide different terms or conditions for housing, or advertise properties only to specific groups. The Fair Housing Act prohibits discrimination based on race, color, national origin, religion, sex, familial status, or disability. These protections ensure that everyone has equal access to housing opportunities.