Perhaps that wasn't the name of the song but just lyrics within that song they played which happened to also be the name of their first album.
Do you remember any of the lyrics to the song?
The first that comes to mind is on Master Of Puppets with the song "Disposable Heroes" which has the lyrics:
"Running blind through killing fields, bred to kill them all."
Or perhaps a timeframe of when you heard them play this at concerts? It could help narrow down the album that the song you are looking for is from. (late '90s after Load / Re-load but before all their shit albums released since then, early '90s after Metallica in 1991 but before Load, or in the late '80s before Metallica but after Justice, etc.)
I was watching their concert, and they were singing "kill them all".
This is all I can find: https://vk.com/video17563321_164101498
Yes, it seems it is established that those words were in the lyrics of the song you heard. I stated that those words may not have been the actual name of the song. When you say you were "watching" their concert, do you mean you "watched" it by means of a video of it and not in person and this video of it displayed the title of the song on the screen and it was labeled as "Kill Them All" (written as "them" not "'em" like the album)?
edit: (sorry, missed that link and am checking it now to see if it can help me to help you find what you're looking for.)
I was watching them live from Germany. I'll wait.
That video is them playing Whiplash which is track 6 from the 1983 Kill 'em All album. If that video of them playing that song is footage from the actual concert that you watched live in Germany, then that helps narrow it down to early 80s when the song was played. That cuts out decades of possible songs.
I still have all their old albums on cassettes in a shoebox from growing up. I also have some live and unreleased garage and live stuff recorded on cassettes like them playing an early version of Devil's Dance before that song was released. It has been decades, but I don't recall any of the songs I have being a recording of a song called Kill Them All. I'll see if I can find a cassette player around here and give those old tracks a listen to see what all is on them.
I've watched their concert in the 90s - 2000.
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