Samuel Adams, a Harvard graduate and brewer, was one of several members of the Sons of liberty, a secret organization formed to further the cause of liberty against King George. Members spoke out publicly against the British crown and used printed material such as this broadside. Today we might call it a poster. In colonial times broadsides were commonly used to bring messages to a mass audience. The Sons of Liberty, along with the various committees of correspondence that coordinated activities among the thirteen Colonies, were determined to obtain rights from England. in this case, they were calling a meeting "... for the purpose of consulting, advising and determining upon the most proper and effectual Method to prevent the unloading, receiving or vending the ... TEA sent out by the East India Company, Part of which being just arrived in this Harbor."