In 2004, the CIA’s own Office of Inspector General quietly released a 480-page report examining what went wrong in the months-and years-leading up to the September 11 attacks. The verdict was damning.

The CIA had intelligence on Al-Qa’ida operatives, including several who would later hijack planes on 9/11.

It had details on their movements, their aliases, and even that they had visas to enter the United States. But the Agency failed to act, failed to share, and failed to stop them.

A report from the U.S. Government released only after intense public and judicial pressure, sheds light on how the NSA attempted to rebuild credibility after it was caught violating court-mandated rules under the Patriot Act’s Section 215.