the issue isn't that the police should not know about specific criminals, but when police overstep their authority and defy their own rules/laws in order to profile (sometimes racially) community members who have not been charged of crimes.

for a specific case, I can point to Portland's own suspected gang member list: http://www.oregonlive.com/portland/index.ssf/2017/09/portlan...

thankfully, it was required to be purged 2 years ago.

unfortunately, that didn't stop them, and an audit found that the same department was ignoring the rules and laws, and keeping an additional secret list to profile community members: http://www.oregonlive.com/portland/index.ssf/2018/03/police_...

these are not necessarily criminals, and it is inappropriate for police to be using automated surveillance to track or monitor them.