During an immigration rally in 2007, Los Angeles Police (LAPD) assault several demonstrators. I posted YouTube videos of the assault a few days after the brutality but since then many of those videos have been removed.
It must be forbidden for the public to learn that police can have a very side to them. Well, I searched around and found few videos of the brutality. None of which, carried the emotional weight that any of the original videos showed, save for one. Here are some suggested articles, followed by the video (note: this is the same video that I've already posted here):
US: Los Angeles police violently disperse immigrant rights demonstration
Los Angeles Punishes Police Official Over Clash at Demonstration
Officers in melee to face censure
LAPD Officer: May Day Mistakes Won't Be Repeated