The ATF has to deal with and investigate a lot of shadowy stuff.
What happens if something (particularly money) happens to get "sticky"?
Well, what would you do with an unregulated, unaudited slush fund?=>Party!

https://www.nytimes.com/2017/02/22/u...t.html?mcubz=1

https://www.nytimes.com/2017/09/08/u...s.html?mcubz=1

Alas, all good things must come to an end
Things that were to be kept under wraps get revealed and some busybody puts a finger in the dyke