https://en.wikipedia.org/wiki/Boston_Tea_Party

While Samuel Adams tried to reassert control of the meeting, people poured out of the Old South Meeting House to prepare to take action. In some cases, this involved donning what may have been elaborately prepared Mohawk costumes.[69] While disguising their individual faces was imperative, because of the illegality of their protest, dressing as Mohawk warriors was a specific and symbolic choice. It showed that the Sons of Liberty identified with America, over their official status as subjects of Great Britain.[70]

That evening about 6 or 7 o'clock a large group of 30 to 130 men or more, armed with axes[71] and some dressed in the Mohawk warrior disguises, went to the wharves where the tea ships were and boarded the three vessels. Over the course of three hours they dumped all 340 or 342 chests of tea into the water.