Ted Kaczynski's brother reveals the letters he wrote the 'Unabomber'

Ted Kaczynski's brother has opened up about the desperate letters he wrote to the Unabomber pleading for forgiveness after turning him over to the .

David Kaczynski, now 75, spent nearly three decades writing to his brother as he languished in federal prison for , sending letters and cards, along with books he thought Ted would find interesting.

The first came just one month after David told the FBI his Harvard-educated brother was unmasked as the domestic terrorist who had killed three people and injured nearly two dozen others.

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