Kidnapping by the book

Via Sigmund, Carl and Alfred,
Online Islamist Forum Hosted in Texas Posts Guide for Kidnapping Americans (emphasis added):

The popular Islamist-jihadist forum www.alhesbah.org, hosted by RealWebHost in Texas, U.S., recently posted an anonymously written document from 2003 titled "The Excellent Summary of the Rules of the Art of Kidnapping Americans." The 60-page guide describes each stage of the kidnapping, explaining how to select the target and then how to follow him, seize him, transport him to a safe location, and hold him there, as well as how to conduct negotiations. The guide also explains how to execute the hostage should negotiations fail.

The guide also includes the qualifications for the kidnappers, too:

As for the kidnappers, the guide states that they should be devout and in good physical condition. In addition, they must be familiar with the locale, and must be able to disguise themselves and to blend in with their surroundings.

My first question reading this is, are there any connection to the gangs currently in the US, to terrorists entering the US, or to the Mexican kidnapping industry?