Notorious S01E02 - Unabomber

Beginning in 1978, a string of university, airline and mail bombings terrorized the country, injured 23 people, and claimed three lives. Investigators chased down hundreds of leads, but for years, the bomber's identity remained a mystery. He was known to the public only as "the Unabomber" until a particular turn of phrase led authorities and introduced the world to Ted Kaczynski.