Sons of Liberty, organization formed in the American colonies in the summer of 1765 to oppose the Stamp Act. The Sons of Liberty took their name from a speech given in the British Parliament by Isaac Barré (February 1765), in which he referred to the colonials who had opposed unjust British measures as the “sons of liberty.”
The origins of the Sons of Liberty are unclear, but some of the organization’s roots can be traced to the Loyal Nine, a secretive Boston political organization whose members included Benjamin Edes and Samuel Adams. The Boston chapter of the Sons of Liberty often met under cover of darkness beneath the “Liberty Tree,” a stately elm tree in Hanover Square. The Sons of Liberty rallied support for colonial resistance through the use of petitions, assemblies, and propaganda, and they sometimes resorted to violence against British officials. Instrumental in preventing the enforcement of the Stamp Act, they remained an active pre-Revolutionary force against the crown.