Id Url Resource class Title Description Source https://policing.umhistorylabs.lsa.umich.edu/s/detroitunderfire/item/237 dctype:Image DPD Security Unit Spying on Anti-Stress Demonstration, February 1973 Security Unit, "Initial Demonstration Information" February 14, 1972, STRESS General Correspondence, Box 448B, Roman S. Gribbs Mayoral Records, Burton Historical Collection, Detroit Public Library