To elaborate:
The Unabomber (Theodore Kaczynski) conducted a bombing campaign that lasted from 1978 to 1995.
He sent or planted 16 bombs in total, all of which exploded.
These 16 explosions resulted in 3 fatalities and injured 23 others.
The bombs were primarily sent through the mail, which is why the FBI code-named him "UNABOM" (UNiversity and Airline BOMber).