In another thread ("Did you know there was another Golden Age Fiddler?" at https://community.cbr.com/showthread...en-Age-Fiddler) it was pointed out that first time DC had a villain known as "The Fiddler", he was a foe of The Vigilante and first appeared in Action Comics #59 (April 1943).
This thread isn't about him.
The perhaps more familiar Golden Age villain called "The Fiddler" was Isaac Bowin, who made his first appearance in All-Flash #32 (December 1947/January 1948).
NOTE: Story was later reprinted in The Flash #160 (April 1966)
from Who's Who: The Definitive Directory of the DC Universe Vol. VIII (October1985)