There are plenty of leaked classified documents from NSA (and others) that have been verified as legitimate. Many people working in public know stuff that hasn’t been published in full.

Here is one example with documents: https://www.spiegel.de/international/world/the-nsa-uses-powe...

Here is another: https://www.spiegel.de/international/germany/inside-the-nsa-...

Please read each and every classified document published alongside those two stories. I think you may revise your comments afterwards.