OK, thanks.

Now, the charges (from the media report, so this may not be perfectly accurate) allege "possessing an unregistered firearm, conspiring to steal firearms from a federally licensed gun dealer, and threatening a candidate for president"

The first seems to be an ATF responsibility, the second seems to be an ATF responsibility, and the third appears to be an ATF responsibility if they were threatening the candidate via alcohol, firearms, or tobacco. Sorry, a moment of levity. The accused do, after all, appear to be nut cases.

What suggests that ATF overstepped their bounds, given the information above on their authority levels?

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