Quock Walker, also known as Kwaku or Quork Walker, was an enslaved American who sued for and won his freedom suit case in June 1781. The court cited language in the 1780 Constitution of Massachusetts that declared, "All men are born free and equal". The case is credited with helping abolish slavery in Massachusetts, although the 1780 constitution was never amended to prohibit the practice explicitly. Massachusetts was the first U.S. state to effectively and fully abolish slavery—the 1790 United States census recorded no enslaved people in the state.

The Constitution of the Commonwealth of Massachusetts is the fundamental governing document of the Commonwealth of Massachusetts, one of the 50 individual states that make up the United States of America. It consists of a preamble, declaration of rights, description of the principles and framework of government, and articles of amendment. It is the highest legal authority in the state, subordinate only to the U.S. Constitution.