When I began my work at CIAD in November 1968, I was given the task of reviewing domestic intelligence relating to the likelihood of the Amy being called again to deploy troops to American cities. With this background in mind, I would be called upon to provide information needed by DCDPO for both planning and operational purposes. My reading diet for this task included classified government documents primarily and voluminously produced by the FBI and to a lesser extent the Army. I found open source, non-classified material was usually of more utility than the classified sources in making judgements about whether and when Regular Army troops needed to be alerted for deployment and possible employment.
By the mid-1970s, I was back in civilian life, and the country had become considerably calmer. I imagine DCDPO withered away with the changing times, and a half-century would pass before the country again saw widespread civil unrest in the early 2020s.