Erm, so the US is a democracy, right? So, all these muppets in government are servants of the US people, right? So, who exactly are they to tell Americans what they have the right to know and not know?
So yeah... what can you do.
The only way I see any change coming is if you can get around 10% of congress recalled in their given states. Unless people are upset enough to do that, you wont see any change. Even if incumbents are thrown out during normal election cycles, congress doesn't seem to get the point. As a whole their approval rating is <15% which is terrible. But their individual approval rating amongst their own constituents is much much higher... There is something wrong with that logic. How do you convince voters that they are part of the problem.
It was supposed to be a Republic. It's now an oligarchy.