This is new. Several years ago, when I called INS, they told me I had to call local police. It was a trick to get through the beat policeman, but when I did, the chief called INS and together they did a raid. It only took me about six weeks to figure it out.
I once had a girlfriend who lived across the street from an apartment with some not so discreet goings-on. Several black fellows that never seemed to go work, but spent much time running to the curb for a quick hello to their friends that would stop by at all hours, and never got out of the car.
One day they made some comments to/about her when she got out of her car to go into her house. I remember her being very angry and threatening a "WE-TIP" or some other such Crime Stopper anonymous type phone call. She was not just threatening.
A few days I heard a helicopter hovering low and went to the window and saw all of these guys face down in the street, cops everywhere, followed by a for rent sign.
Don't know if it was her call or not, but it sure couldn't have hurt.