Theodore John Kaczynski aka the "Unabomber" is a former mathematics professor, a domestic terrorist, and serial killer who between 1978 and 1995 killed 3 and wounded 23 others by attempting to start a nationwide combing campaign targeting people involved with modern technology. 
Kaczynski was found dead in his cell on June 10, 2023. 
 
Woodmans postcard with a quote on the front from, Robert Pike.
Handwritten message and complete mailing address on the backside. 
Hand signed twice. Hand signed at the top, Theodore John Kaczynski.
Hand signed at the close, Ted.