WIKI:The Massachusetts Government Act (14 Geo. 3 c. 45) was passed by the Parliament of Great Britain, receiving the royal assent on 20 May 1774. The act effectively abrogated the existing colonial charter of the Province of Massachusetts Bay, and gave its royally-appointed governor wide-ranging powers. The Act is one of the Intolerable Acts (also known as Repressive Acts and Coercive Acts), designed to suppress dissent and restore order in Massachusetts...in the wake of the Boston Tea Party;When Governor Thomas Gage invoked the act in October 1774 to dissolve the provincial assembly, its Patriot leaders responded by creating the Massachusetts Provincial Congress, which acted as the province's (and later the independent state's) de facto government until the 1780 adoption of the Massachusetts State Constitution.
So, looks like patriot government was established in Massachusetts in Oct 1774; I guess I need to investigate the appointment of Nathaniel Munger much further.....