While an interesting compilation of potential conspirators, it suffers somewhat from being intended primarily as a companion for the "100 Conspiracies" source book. This means that the conspirators listed tend to focus on the aspects of the organizations and individuals that lend themselves to those conspiracies, and limits the author's ability to explore their other ramifications. While the author attempts to make up for this issue with the "adventure seeds," he still is limited in what he can provide, by his own format, and the requirement to tie in with the other source book.
Still, it's an excellent look into some strange organizations that have existed down through the centuries, though admittedly he focuses on the more commonly explored ones as revealed on "The Discovery Channel."
Pros: Generally good thumbnail descriptions of various esoteric organization and individuals with plenty of names and concepts that you can use for further research. Really it's an excellent primer on the subject, without providing more than a quick scan of the 100 organizations and individuals.
Cons: The author tends to permit his personal biases to show through, generally debunking "liberal" conspiracies while lending some small credence to various "conservative" conspiracies (lefties are good guys, righties are baaad). Given that most of these organizations are either defunct or populated by the lunatic fringe on both sides of the aisle, this seems somewhat disingenuous. Like its companion volume, this one too is riddled with grammatical, punctuation and spelling errors that would have easily been avoided had the author or the publishing company taken a few minutes to actually read the product before publishing it.
I give it three stars based on the fact that it's primarily a back-up to a back-up, and as a comment on the poor editorial effort by the author/publisher.