In The Avengers (2012), during the first meeting aboard the helicarrier, Thor warns Bruce Banner to mind his manners when speaking of Loki, because he's Thor's brother, to which Black Widow replies:
He killed eighty people in two days.
Thor responds, "He's adopted" [Insert laugh here].
I assume Loki killed the guy whose eye he scanned and/or scooped out, and I know that Hawkeye killed a couple of people, but what about the other 77 or so people?
Who are these eighty people, and when did Loki kill them?