In Dec 2012, details of gun permits issued in Westchester, Rockland and Putnam counties just north of NYC were posted on an interactive map [1]. This was a nearly perfect test of the theory that criminal behavior would get worse in response to easy access to this kind of information. I found no news reports indicating people had been targeted one way or the other, and official stats [2] indicate serious crime decreased.
[1] https://www.npr.org/sections/thetwo-way/2012/12/26/168075748...