Mass. Const. pt. 2, ch. 1, § 1, art. 3

The general court shall forever have full power and authority to erect and constitute judicatories and courts of record, or other courts, to be held in the name of the commonwealth, for the hearing, trying, and determining of all manner of crimes, offences, pleas, processes, plaints, actions, matters, causes and things, whatsoever, arising or happening within the commonwealth, or between or concerning persons inhabiting, or residing, or brought within the same, whether the same be criminal or civil, or whether the said crimes be capital or not capital, and whether the said pleas be real, personal, or mixed; and for the awarding and making out of execution thereupon. To which courts and judicatories are hereby given and granted full power and authority, from time to time, to administer oaths or affirmations, for the better discovery of truth in any matter in controversy or depending before them. [See Amendments, Art. XLVIII, The Initiative, II, sec. 2, and The Referendum, III, sec. 2.]