LAPD Public Disorder Intelligence Division

The Public Disorder and Intelligence Division (PDID) was a unit of the Los Angeles Police Department between 1970–1983 that mobilized undercover officers to monitor the activity of local activist organizations suspected of criminal activity. Created by Chief Edward M. Davis and later overseen by Chief Daryl Gates, PDID was disbanded in 1983 amid public pressure.

Source: Wikipedia — LAPD Public Disorder Intelligence Division (CC BY-SA 4.0)