Sensitive Compartmented Information is information that not only is classified for national security reasons as Top Secret, Secret, or Confidential, but also is subject to special access and handling requirements because it involves or derives from particularly sensitive intelligence sources and methods.

CNN

And many of those new organizations are compartmented or work on their own or are not tied into the overall system, and that's one of the problems that we discovered.

NPR: Intelligence Failures In 'Top Secret America'