There's even a name for it: "Police Riot" https://en.wikipedia.org/wiki/Police_riot https://en.wikipedia.org/wiki/Police_riot No need for agent provocateurs;

There's even a name for it: "Police Riot" https://en.wikipedia.org/wiki/Police_riot https://en.wikipedia.org/wiki/Police_riot No need for agent provocateurs; most crowds react poorly when riot police start pushing them around. For example, to enforce a curfew against a peaceful crowd => riot => see, the curfew was justified! They were rioting!