There is no internet (let alone social media or body cams) during that era, since Jim Crow in America was still being enforced towards black people at that time, but the civil rights movement is gaining traction (since Martin Luther King was alive). I mean, cop violence has been around for a long time before body cams were invented. How did people hear first hand encounters from those victimized back then without reliance on social media?
Emmit Till’s coffin. No, but it was a lot worse back then. People were more violent in general. It was common for fights to break out. Gentility has always been reserved for the upper class. It was expected and the point that the lower classes got roughed up.