Isn't this power already a well-established (though also fictional) part of the US system?

What I mean by the parenthetical statement is that while the legislative branch does have an established right to ask the disclosure of information, their power to actually compel is limited. Without cooperation from the other branches of government, what they directly control is a handful of operatives who maintain no facilities for detaining people for the long term.

To be clear, the Jan 6 Committee sent criminal referrals to the DoJ, so the judicial system is the one deciding the fate of these individuals, not the Committee. In fact Steve Bannon's due process has been preserved; he has a court date set and he is currently free on bail. Mark Meadows has not been charged yet, but that will also be decided by the DoJ.

It's worth pointing out though, that Congress does in fact have a power of inherent contempt that enables them to enforce their own subpoenas. This is a separation of powers concern: what if Congress needs to subpoena someone in the Executive branch or DoJ in particular?

THey are the only thing standing between us and a fascist government beginning in 2024 when Trump is reelected. If they don't take down his coup attempt and get him banned from office for life, this country as we know it is over.