Are you really unaware of this? It was the top story in the country for months. A documentary about it even won an Oscar. As someone else has already replied, we are talking about the vast domestic spying apparatus that Snowden revealed, including the PRISM and xkeyscore programs. They are unquestionably unconstitutional and illegal. Anyone that suggested they existed before the reveal was an insane paranoid nutjob. Furthermore, the fact that there was virtually nothing done about this severe crime by the rest of the government indicates that the entire system is a farce. The NSA is still doing the same thing as before, and probably more.

Another angle is how do you prosecute the head of intelligence when everything is supposed to be secret.

That is what Denmark is trying to find out:

https://www.reuters.com/world/europe/denmark-charges-spy-chi...

The first thing that comes to my mind is the whole Snowden series of events. Spying every citizen, is wrong. Also, I'm seeing the effects of something similar in my country, where this sort of spying is used to curb free speech, dissent, and completely kill the very essence of democracy.

It is wrong, and there has to be better ways. I don't remember the exact procedure, but NSA didn't need much clearance to spy on any American citizen.