"Organized stalking"? We call that surveillance. 
Seriously, what makes the stalking "organized"? Like already mentioned, a car hanging out in your area does not necessarily count as stalking. I'm not going to get into teaching it, but do some google research on cleaning... do a little of THAT, and you will KNOW if you are being stalked.
If you have a REASON to be stalked AND really think you are being stalked, talk to LE. Most people, myself included, are just too boring to be stalked for no reason at all.
We bring evil things to evil people, kicking in a door near you!
."In theory, there is no difference between theory and practice. But,
in practice, there is."
- Jan L.A. van de Snepscheut
"The difference between 'involvement' and 'commitment' is like
an eggs-and-ham breakfast: the chicken was 'involved' - the pig
was'committed'."
-unknown
Working on a PhD in CQB one doorway at a time.
When the wolf attacks, he will find not all who run with the flock are sheep!