This is fascinating so far. Stallworth occasionally writes a bit about being Colorado Springs' first black police officer and the challenges he faced - even something as simple as getting a uniform cap that would properly fit his head. He had a small Afro at the time and was deliberately measured so his cap was a size and a half too small to accommodate it.
He's only just now getting into the KKK thing a bit more. I had wondered why the CSPD continued with the two-man thing after the initial phone call, considering it would have been easier for a white man to just play both the phone and in-person role. The way things were set up, Stallworth was the phone guy and his fellow officer, Chuck, was used in in-person meetings, and they had to keep track of each other's conversations to make sure they could believably pretend to be the same person. It turns out that they did this because Chuck's availability was limited - Stallworth had involved him spur-of-the-moment. Also, Stallworth only narrowly got permission (went over his direct superior, in fact) for a potentially lengthy undercover operation.