Fred Foldvary asked:
>Were any economists prior to the 1930s for a pure free
>market?



Ludwig von Mises for sure.  He published a series of articles in the 1920s
critical of interventionism.  They are collected in A CRITIQUE OF
INTERVENTIONISM, Arlington House, 1977 (originally published in 1929 as
Kritik des Interventionismus, Gustav Fischer Verlag).

Samuel Bostaph