Mass. Gen. Laws ch. 121B § 6

A member of a housing or redevelopment authority who ceases to be a resident of the city or town shall be removed upon the date of his change of residence by operation of law. A member of a housing authority appointed as a tenant, in accordance with the provisions of section five, who ceases to be a tenant in a building owned and operated by or on behalf of the local housing authority shall be removed upon the date of such change by operation of law. A member of a housing authority who is a tenant in a housing project shall not participate in any decision relating to the project affecting his personal interest.