Origin
Fallon of the FBI was a trough as nails special agent of the Federal Bureau of Investigation who worked mostly by himself ferreting out spies, saboteurs and other foreign ne’er-do-wells who were trying to do our country ill.
He was also known for having a special charm for lady spies who almost always fell for him. Not that it did the Commie fem fatales any good!
Creators
For the whole of his short run the art for Jim Fallon of the FBI was supplied by Fred Guardineer, the writer is unknown.