Justice Unified Telecommunications Network
This network, also known as JUTNet, is used for transmitting sensitive but unclassified information (such as fingerprint and arrest information) pertaining to the investigation and prosecution of crimes and terrorist activities. In addition, it supports video-conferencing and certain voice over Internet protocol services.
(Description comes from from General Accounting Office document GAO-07-455
The GovITwiki Intelligence Agencies page lists the U.S. government's major secret and sensative but Unclassified networks.