I included a link to the group that I found at the bottom of my post. The article says that the group was only referred to by the name “TFC” and that it would jokingly call themselves “Trail Fucking Crew”, but that some referred to the group as “Trail Fixing Crew”.

Another link.

https://www.npr.org/2016/09/04/492599414/for-new-hampshire-s-white-mountain-trail-crew-comfort-comes-second-to-ragged-fun