Prominent writers like Max Frisch, Adolf Muschg, Peter Bichsel and Friedrich Dürrenmatt had left the SSV (which they considered to be unprogressive) and became members of the Gruppe Olten.
Olten–Lausanne railway line | Olten | ''Gruppe''-sized | EHC Olten | Otto Gruppe | Emile Gruppe | Charles P. Gruppé |