Maybe you once thought the CIA wasn't supposed to spy on Americans here in the United States.

That concept is so yesteryear.

Over time, the CIA upper echelon has secretly developed all kinds of policy statements and legal rationales to justify routine, widespread surveillance on U.S. soil of citizens who aren't suspected of terrorism or being a spy.

The latest outrage is found in newly declassified documents from 2014. They reveal the CIA not only intercepted emails of U.S. citizens but they were emails of the most sensitive kind - written to Congress and involving whistleblowers reporting alleged wrongdoing within the Intelligence Community.

The disclosures, kept secret until now, are two letters of "congressional notification" from the Intelligence Community inspector general at the time, Charles McCullough. He stated that during "routine counterintelligence monitoring of government computer systems," the CIA collected emails between congressional staff and the CIA's head of whistleblowing and source protection.

McCullough added that he was concerned about the CIA's "potential compromise to whistleblower confidentiality and the consequent 'chilling effect' that the present [counterintelligence] monitoring system might have on Intelligence Community whistleblowing."

"Most of these emails concerned pending and developing whistleblower complaints," McCullough stated in the letters to lead Democrats and Republicans at the time on the House and Senate Intelligence Committees - Sens. Dianne Feinstein (D-Calif.) and Saxby Chambliss (R-Ga.), and Reps. Mike Rogers (R-Mich.) and Dutch Ruppersberger (D-Md.).

The March 2014 intercepts, conducted under the leadership of CIA Director John Brennan and Director of National Intelligence James Clapper, happened amid what's widely referred to as the Obama administration's war on whistleblowers and mass surveillance scandals.

Is that legal?

According to the CIA, the spy agency has been limited since the 1970s to collecting intelligence "only for an authorized intelligence purpose; for example, if there is a reason to believe that an individual is involved in espionage or international terrorist activities" and "procedures require senior approval for any such collection that is allowed."

But here's where it gets slippery. It turns out the CIA claims it must engage in "routine counterintelligence monitoring of government computers" to make sure certain employees aren't doing bad things. Poof! Now, all kinds of U.S. citizens and their communications can be swept into the dragnet - and it's deemed perfectly legal. It's just an accident or "incidental," after all, if the CIA happens to pick up whistleblower communications with the legislative branch.

Or maybe it's a lucky break for certain CIA officials.

The only reason we know any of this now is thanks to Sen. Chuck Grassley (R-Iowa), whose staffers were among those spied on. Grassley says it took four years for him to get the shocking "congressional notifications" declassified so they could be made public. First, Grassley says, Clapper and Brennan dragged their feet, blocking their release. Their successors in the Trump administration were no more responsive. Only when Grassley recently appealed to current Intelligence Community Inspector General Michael Atkinson, who was sworn in on May 17, was the material finally declassified.

"The fact that the CIA under the Obama administration was reading congressional staff's emails about Intelligence Community whistleblowers raises serious policy concerns, as well as potential constitutional separation-of-powers issues that must be discussed publicly," wrote Grassley in a statement.

Legal or not, there was a time when this news would have so shocked our sensibilities - and would have been considered so antithetical to our Constitution by so many - that it would have prompted a swift, national outcry.

But today, we've grown numb. Outrage has been replaced by a cynical, "Who's surprised about that?" or the persistent belief that "Nothing's really going to be done about it," and, worst of all, "What's so bad about it, anyway?"

Some see the intel community's alleged abuses during campaign 2016 as its own major scandal. But I see it as a crucial piece of a puzzle.

The evidence points to bad actors targeting candidate Donald Trump and his associates in part to keep them - and us - from learning about and digging into an even bigger scandal: our Intelligence Community increasingly spying on its own citizens, journalists, members of Congress and political enemies for the better part of two decades, if not longer.

Sharyl Attkisson (@SharylAttkisson) is an Emmy Award-winning investigative journalist, author of The New York Times bestsellers "The Smear" and "Stonewalled," and host of Sinclair's Sunday TV program, "Full Measure."