They're different, but not that much. In all 3, the cops are definitely NOT working for the citizens, they're working for the people in power and oppressing an

They're different, but not that much. In all 3, the cops are definitely NOT working for the citizens, they're working for the people in power and oppressing and brutalizing the citizens. The root causes are a little different, and the targeted groups are a little different, but overall it's pretty similar. In civilized countries, the cops mostly work for the citizens, to keep the peace, and don't brutalize and murder people with impunity. I'd say one big difference is who the people in power are, that the cops are working for: in China/Russia, it's the dictator. In the US, it's really for themselves, and whatever corrupt local leaders they're friends with. In the US, law enforcement really resembles organized crime.