My neighbor is killing off bees. What can I do to stop this?

First off, I am aware that there is a worldwide shortage of honey bees. I am also aware that bees are protected by law, in that it is actually a crime to kill off a hive. That being said, I have a neighbor who is doing exactly that. He/she/it is not just swatting the random bee here or there, or modifying wasp traps to actually catch bees that fly into them, but is actually killing them en masse.

On a daily basis, I find an inordinate number of dead bees littering the sidewalk out in front of a nearby building. And by inordinate, I mean that it could never be accidental, with the sheer volume of them. We are talking hundreds of bees a day littering the sidewalk. They can be found littering the sidewalks and gutter, all on their backs, with twitching legs.

I know that bee hives can be removed for free, and some bee keepers will even pay you to take the hive away, as they ultimately profit from doing so. What i don't know is who i can contact to report this problem. I do not know why my neighbor is doing this, but knowing the common honeybee is considered a threatened species, I don't like the idea of just ignoring this.

So, my question to you, is who can I call about this? I doubt there is a "bug police" or a "honeybee welfare services" or anything nutty like that. I would like to ultimately see this hive removed and relocated to someplace where it can be more useful and productive, and less of a hazard to people's safety.