I would seriously consider taking the list of Congresspeople who are going to be running this hearing, extracting out the information you already have on them from your dumps, and preparing them a personal sheet of paper for each one showing them what you have about them online.

If it's in public, you can't read it to them, but you might be able to hand it to them personally.

This will be far more powerful than almost anything else you could do. It's not a problem "Americans" have... it's a problem they have.