Shemp Howard ( 1895-1955)
which also featured boxer/actor Maxie Rosenbloom (1907-1976)
who was also in the film from 1937 called "Nothing Sacred"
which featured Fredric March (1897-1975)
who took part in "Mary of Scotland" (1936)
in which John Carradine (1906-1988) was also featured
and we already know of John Carradine's for his appearance in 1939's "Hound of the Baskervilles"