IBM Selectric Bug - https://news.ycombinator.com/item?id=21947924 - Jan 2020 (4 comments)
Operation Gunman – how the Soviets bugged IBM typewriters (2015) - https://news.ycombinator.com/item?id=16246432 - Jan 2018 (18 comments)
Operation Gunman – how the Soviets bugged IBM typewriters - https://news.ycombinator.com/item?id=13255334 - Dec 2016 (9 comments)
Selectric bug - https://news.ycombinator.com/item?id=10773214 - Dec 2015 (17 comments)
Learning from the Enemy: The Gunman Project (2007) [pdf] - https://news.ycombinator.com/item?id=9954159 - July 2015 (43 comments)