The committees of correspondence were a collection of American political organizations that sought to coordinate opposition to British Parliament and, later, support for American independence during the American Revolution. The brainchild of Samuel Adams, a Patriot from Boston, the committees sought to establish, through the writing of letters, an underground network of communication among Patriot leaders in the Thirteen Colonies. The committees were instrumental in setting up the First Continental Congress, which convened in Philadelphia in September and October 1774.