It's in a name...

Imported from an older blog, commentary on Marvel Comics' Thunderbolts #110

Yes, sure, give the company that makes the propaganda toys making the villains look like heroes and the other way 'round a German name; frequent (and in contrast to this reasonable) Nazi references in the Civil War storyline really weren't enough. -_-

My first association for translating "Mittelwerk" would be "middle work", but I'm not sure if that makes sense.
"Mittel" can mean "middle, center" - for example "Mittelerde" is the German name of Middle-earth - but also "means" or "instrument" ("Mittel zum Zweck" = "means to an end"; "Der Zweck heiligt die Mittel." = "The aim justifies the means.")

Considering context, I suspect the aim was something like "tool factory".

Edited to add: Turns out I was wrong, and this is not a "German= evil" reference, but another Nazi reference, Mittelwerk having been an actual factory producing weapons during WWII.

It's still obviously something on author/real world level (or could you imagine an American company naming itself after a Nazi weapons producer?), and therefore I consider it gratuitous.