I still think it'd be a good idea to start with the henchmen in civil service jobs. The Pendleton Act and its various amendments over time do not protect them from impeachment ~ just from being fired by the Executive without cause.
Congress is NOT the Executive, and I think some low level impeachment hearings would LOOSEN TONGUES ~ as they destroy the careers and credit worthiness of the targeted employees.
You're right, that's precisely the right approach. Impeachment of some underlings would not present the same political problems - for the Republicans, at least -that would be entailed in impeaching Holder, never mind Obama (who must be presumed to have been behind the effort to politically undermine the Second Amendment with disgraceful activities under his administration).But it would make Obama sweat almost as if it were Holder himself. Perhaps more so if, as you suggest, it would loosen a few tongues . . .
“...as they destroy the careers and credit worthiness of the targeted employees.”
Not really. Any impeached employee would become an immediate hero to the left and would have a nice career giving speeches to leftists.