Executioner lineage - where to find more?

by JenV
(Wisconsin)

Hello,
As I have learned over the past few years of researching this, I felt I have exhausted what is found online. My husband has an enormous line of executioners in the Alsace region that has been SO fascinating to research, but I'd love to learn more. I find it hard to believe there isn't a group or records on them as it was such a close-knit group that intermarried over the centuries. Where can I go next - and I am fairly fluent in French and have found that Google translate at least gets me through German fairly well.
The surnames I would be looking for more on are: RAUCH, GROSHOLTZ, GINTER, WASSE/Wees, KIRSCHNER, BURCKHARDT, HALTER, IMMION, RUEB and HEIDENREICH.