Answer:
"The main purpose of the Boston Non-importation agreement was to protest the Townshend Revenue Act and boycott the majority of British goods. It was signed by Boston merchants and traders on August 1, 1768, and was effective from January 1, the very next year." (wikipedia)
"The existing non-consumption movement soon takes on a political hue as boycotts are encouraged both to save money and to force Britain to repeal the duties." (https://www.masshist.org/revolution/non_importation.php)
