From Action Comics #3 (August 1938). Written by Jerry Siegel; drawn by Joe Shuster.
Another example of Superman’s fighting social injustice by sticking it to the Man. In this issue, he battles a greedy industrialist who’s skimping on safety measures in his mine. What’s interesting about the story is that Superman only appears in costume in one panel. Most of the time he’s undercover as a mine worker. This wouldn’t be the last time Superman took the undercover approach either.