There are a minimum of 25 active serial killers at one time in the US.
Source: Multiple Sources - They disagree on the high end. It ranges from 50-2,000.
Handbooks & Manuals
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Neighborhood Watch Organizer's Guide
This is the leader’s guide and is quite brief. I suggest everyone start here first. It is best that you know the purpose, place, and function of the basic neighborhood crime watch.
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Neighborhood Watch Manual
This document was prepared by the National Sheriffs’ Association. It was created for citizen organizers and law enforcement officers that work with community members to establish watch programs. The material contained covers a number of topics and provides suggestions for developing a watch program. However, please incorporate topics and issues that are important to your area into your watch.
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Block Captain's Handbook
This manual details Neighborhood Crime Watches and how they work. You’ll discover that each Watch Program is different because of local priorities. Your program will depend on what individuals, families, and neighborhoods in your community want to achieve. What are folks most concerned about where you live? Is it crime prevention? Child safety? Speeding drivers? Terrorist threats? Your Community Watch Program can address all of these issues.