Alex S. Vitale, professor of sociology at Brooklyn College, offers many useful sources on his website. See also The End of Policing (updated Dec 2021).
History of Policing materials from Zinn Education Project.
“The Narrative” and “The Protectors” and “The Law” are three videos in the “How Cops Get Off” series from the Advancement Project’s national office. The campaign page offers more, including discussion guide and more reading suggestions.
Alec Karakatsanis provides a series of “Copaganda” posts with detailed notes on how copaganda shows up in regular reporting. Available as a newsletter and via Twitter