Watchdog n. : A dog kept to watch and guard premises or property, and to give notice of the approach of intruders.

Example:
How do I start a political Watchdog?

Taxonomy
registered sex offenders, Sex Offender, Family Watchdog, offenders, Map, Holdings, National Sex Offender Registry, product recalls, safety portal, Molester, Public Safety, Predator, SexOffender, private profile, safety tips, text messages, cell phone, purchase.

Defination from the web:
Offers a free service to locate registered sex offenders in your area.