Would a journalist whose written for Bellingcat, and been a war correspondent be enough, if so here's a podcast about how Chiropractors came to be a thing:

https://www.youtube.com/watch?v=f8lLVK_1O6s

It's a good podcast called Behind The Bastards.

Also of note is that Chiropractic practice has a yearly death toll... People literally die and become disable by their manipulations each and every year. It's dangerous pseudo science, developed by spiritualist "healers".