What I found interesting was the arrests that came shortly after the CIA released their report on Russia's interference in our elections. One department head who was supposed to make sure there were no spies in their ranks was taken out of a meeting with a bag on his head, and another one (who was a spy working for us), was also arrested and hasn't been heard from since.
Why would Russia purge people out of their ranks when this report came out, unless there was actual information in there that they really did?
You don't fire people or put them in prison if a report like that is completely false, you only do it if it tells the truth.