present:
Spain tightens security at government buildings after letter bombs found

https://www.theguardian.com/world/2022/dec/01/spanish-police-investigate-four-devices-ukraine-embassy-blast-madrid

past:
The Bombs Addressed to Obama, Clinton, and Soros, and the History of Anti-Soros Hate-Mongering

https://www.newyorker.com/news/current/the-bombs-addressed-to-obama-clinton-and-soros-and-the-history-of-soros-mongering