General Laws: CHAPTER 1, Section 2

PART I ADMINISTRATION OF THE GOVERNMENT
(Chapters 1 through 182)
TITLE I JURISDICTION AND EMBLEMS OF THE COMMONWEALTH, THE GENERAL COURT, STATUTES AND PUBLIC DOCUMENTS
CHAPTER 1 JURISDICTION OF THE COMMONWEALTH AND OF THE UNITED STATES
Section 2 Sovereignty and jurisdiction of commonwealth

Section 2. The sovereignty and jurisdiction of the commonwealth shall extend to all places within its boundaries subject to the concurrent jurisdiction granted over places ceded to or acquired by the United States.