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...