I wish to pass on the link provided by New Mandala about an article on Thai voodoo written by Pasuk and Baker.
It is a fascinating read. Over the years, I have learned bits and pieces about particular aspects of astrology, amulets, and black magic(honestly, don't care much about it), but this article really puts it all together in a way that ties it into politics and power.
Here is the pdf.
In the modern age, you might think this stuff is kooky, but not really all the much different than the US politicians running around "God blessing everything," or medieval European monarchies and their rituals, or what the Romans and the ancient Aztec and Mayan kingdoms did.