Final answer:
The most arrested chiropractor in the 1900s was William J. Simmons, who faced multiple arrests for practicing without a license and making false claims about chiropractic treatment.
Step-by-step explanation:
The most arrested chiropractor in the 1900s was William J. Simmons. He was arrested multiple times for practicing medicine without a license and making false claims about the effectiveness of chiropractic treatment. Simmons was a controversial figure in the early days of chiropractic, as many medical professionals considered the practice to be unscientific and potentially dangerous. Despite the legal troubles, chiropractic eventually gained recognition as a legitimate healthcare profession. It's worth mentioning that while Simmons was one of the most arrested chiropractors, there were others who faced legal challenges during that time as well.