Who do we trust even though we don't know them? Who passes unnoticed wherever they go? Who hunts in the middle of a crowd?

Wrong, THINK!

@shygirl96: But, has it something to do with SW? As you chose Community as the cathegory.
Or is it in general?
If it's in general, could they be the shades, shadows?

It is in general, I just chose community because I thought it was just a question for the community!

No, not a shadow. I'll give you a hint: they know the city they're in like the back of their hand.