Are there any agencies that protect citizens from police?

A detailed description of what i'm trying to suggest. Are there any agencies in America that watches and impose the law on fellow law enforcement officials? Would anyone advocate the suggestion that before anyone in the community is placed under arrest, the community should be able to vote on whether or not the crime committed should be punishable by being placed in jail? For an example, someone is arrested for crossing the street outside of the pedestrian area and placed under arrest and taken to jail, why? Wasn't that their choice, which we were all granted since birth. Shouldn't a citation be punishable enough. But do you get my emphasize on letting the community vote on who shall be placed in the justice system versus someone who's forced into the justice system? It would result in a shift of power but for good reasons, the first would be making the mistake of trusting the Police to be correct ALL THE TIME. At least this way, if their wrong- they can continue with their work load rather than, removing someone from the community, transporting this person to a detention center, placing them into an unsafe and extremely unsanitized hazardous area with real criminals, and charging all lot of hidden fee's to get released and then they have to find a way home- no justice in that, no fairness in that.