The Massachusetts Commission Against Discrimination (MCAD) is the state agency responsible for enforcing the Massachusetts Fair Housing Law (M.G.L. c. 151B). Blockbusting is the illegal practice of inducing homeowners to sell by suggesting that protected classes of people (such as minorities, families with children, or people receiving public assistance) are moving into the neighborhood, often suggesting declining property values.

This practice is explicitly prohibited under both federal law (Fair Housing Act) and Massachusetts General Law. MCAD has the authority to investigate complaints of housing discrimination and levy fines against licensees found guilty of such violations.

While misrepresentation or undisclosed dual capacity may lead to disciplinary action by the Massachusetts Board of Registration of Real Estate Brokers and Salespersons, only violations of fair housing law, such as blockbusting, steering, or refusing to deal with members of protected classes, fall under the jurisdiction of MCAD.