Buy American campaigns that oppose the outsourcing of jobs overseas by boycotting imports.
You see how successful those boycotts have been? It's like placing sanctions on Cuba.
The Boston Tea Party was about the action of a government. Not a private business.
Choosing not to buy certain products is your own business. The minute you send letters to uninvolved third parties, you're stepping over the line. It's one thing to have the courage to stand up for one's beliefs. It's another thing to deal with the consequences.