What an amazing fic! Dark!Sam is not something I've come across before and I'm still reeling! But you made it very plausible. I particularly liked that phrase about the workers being ghosts of the manufacturing crash to come. Kudos!

Two typos (yes, I still have a virtual red pen behind my ear). One in your title to this post where you spell it Scavanger instead of, as in the title of the fic itself, scavenger. One at the start of the last section where I think you mean 'his tongue' rather than 'this tongue'.