Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 4, § 12

Establishment, cancellation or change of enrollment in a political party shall, for the purposes of any law establishing or limiting the number of members of any board, commission or other body who shall or may be members of any political party or the same political party, take effect two years thereafter. Any enrollment required for appointment to such a board, commission, or other body must have been maintained continuously during the two years immediately preceding appointment.