Can anyone who understands the US TLA agencies explain why the FBI was doing this, rather than the CIA?
My guess is that the FBI was trying to catch American citizens in the act of whistleblowing, so that they can make an arrest. America is not kind to people that expose corruption. Although we have "whistleblower protection programs", they have so many exceptions that they are a sham. Whether they go to the press, the police, or directly to the FBI, many whistleblowers end up in serious legal trouble and often spend time in jail. Citation: List of whistleblowers.