Historically, one of the most notable figures who reacted to increased taxation without representation with nonviolent protest, such as boycotts, is Mahatma Gandhi. Although Gandhi's activism was primarily in the context of British colonial rule in India, he championed various nonviolent forms of protest, including boycotts of British goods and institutions, in response to unfair taxation and oppressive laws.
In the context of American history, the Boston Tea Party, which was a response to the Tea Act imposed by the British government, was a form of protest against taxation without representation that involved the destruction of property; however, figures like Samuel Adams advocated for boycotting British goods as a nonviolent method.
Both scenarios illustrate the effectiveness of nonviolent protest in response to perceived injustices, such as taxation without representation.