Established by William F Friedman to research the Voynich Manuscript, and in existence 1944-6.
Some details can be found here, which lists the known members as:
- Robert A. Caldwell
- G. E. McCracken
- Thomas A. Miller
- Frances Puckett, later Frances Wilbur - obituary here
- Mark Rhoads
- William M. Seaman
The minutes of the FSG can be found here.
Another mention here.
See also Second Study Group.