David Kaczynski is the younger brother of Ted Kaczynski, a man who is famous for what?
David Kaczynski: David Kaczynski (born October 3, 1949) is the younger brother of the "Unabomber" Theodore Kaczynski. Ted Kaczynski: Theodore John Kaczynski ( ; born May 22, 1942), also known as the Unabomber, is an American mathematician, anarchist and domestic terrorist. Ted Kaczynski:  A mathematical prodigy, he abandoned a promising academic career in 1969, then between 1978 and 1995 killed 3 people, and injured 23 others, in a nationwide bombing campaign that targeted people involved with modern technology.
between 1978 and 1995 killed 3 people, and injured 23 others, in a nationwide bombing campaign that targeted people involved with modern technology