Justice Inc., The Role-Playing Game of the ’20s & ’30s, compatible with Champions and all Hero System games, by Aaron Allston, Steve Peterson, and Michael Stackpole, cover art by Brian K. Hamilton, Hero Games, 1984.
Justice Inc. tries to cover the full range of classic pulp story themes in its two rulebooks, including crimefighting, detective and mystery, espionage, western, horror and occult, and science fiction.
I love reading this game.
The source book in the box is a real gem - defining so many settings which are all classed as “Pulp”.
Edit: This was a game which first introduced me to the possibility that players could trade a character weakness for extra abilities or resources (a fairly common notion now).