Mass. Gen. Laws ch. 251 § 2A
A party aggrieved by the failure or refusal of another to agree to consolidate one arbitration proceeding with another or others, for which the method of appointment of the arbitrator or arbitrators is the same, or to sever one arbitration proceeding from another or others, may apply to the superior court for an order for such consolidation or such severance. The court shall proceed summarily to the determination of the issue so raised. If a claimant under section twenty-nine of chapter one hundred and forty-nine applies for an order for consolidation or severance of such proceedings, the issue shall be decided under the applicable provisions of said section twenty-nine of said chapter one hundred and forty-nine governing consolidation or severance of such actions; otherwise the issue shall be decided under the Massachusetts Rules of Civil Procedure governing consolidation and severance of trials and the court shall issue an order accordingly. No provision in any arbitration agreement shall bar or prevent action by the court under this section.
Mass. Gen. Laws ch. 251, § 2A