Gary Greenberg's "In the Kingdom of the Unabomber"[1] is a pretty interesting write-up of the palace intrigue stuff surrounding Kaczynski while he was in prison, Greenberg also did a great interview with Errol Morris about it.[2]

[1]: best quality I can find right now: https://www.garygreenbergonline.com/media/unabomber_letter.p...

[2]: https://www.youtube.com/watch?v=ECNsiK5MB-4&list=PLVmRJGCDzW...