The Commonwealth's laws are promulgated by an elected bicameral ("two-chamber") legislative body, the Massachusetts General Court.
The official publication of Session Laws for any given year is called the Acts and Resolves of Massachusetts, and is compiled and published annually by the Secretary of the Commonwealth.
A Resolve is most typically used to establish a special commission to investigate a certain issue.
They are codified according to subject matter into a multi-volume publication entitled the General Laws of Massachusetts.
Provisions in the General Laws are identified by chapter and section, e.g., Mass.