That's Nessun Dormait means "Let no one sleep"
youtube of it being sung in the movie :Sum Of All Fears" as those plotting against US were being taken out:
Gonna rewatch Godfather III tonight.
Just saw this.
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https://fox59.com/news/small-plane-crashes-in-illinois-kills-indiana-judge/amp/?__twitter_impression=true
Small plane crashes in Illinois, kills Indiana judge