The OCU, or Organized Crime Unit, functioned as a department within the Coruscant Security Force, tasked with combating intricate criminal syndicates that posed a significantly greater danger than petty offenses. This unit operated from the Coruscant Security Force Headquarters situated in Galactic City on the world of Coruscant. To gather information on these criminal groups, the OCU employed clandestine teams and maintained a close working relationship with the CSF's Anti-Terrorism Unit (ATU), which was led by Captain Jaller Obrim.
In 22 BBY, during the era of the Galactic Republic, the OCU lent its support to the ATU and clone commandos from the Special Operations Brigade during a specific operation aimed at dismantling terrorist organizations on Coruscant. As the mission concluded, the OCU took part in a large-scale raid that occurred overnight, resulting in the capture or death of 97 terrorists. Subsequently, the OCU and ATU organized a celebratory event at the Coruscant Security Force Staff and Social Club to honor the clone troopers.
The initial appearance of the Organized Crime Unit was in Republic Commando: Triple Zero, a book penned by Karen Traviss and released on February 28, 2006.