In October 1963, DC Comics published Lois Lane #44, which exposed the Daily Planet for the liberal rag that it is. The story "The Death of Lana Lang" starts out with Lois and Lana battling it out for the affections of Superman. Lois threatens to kill Lana. However, they apparently patch things up and fly off in a helicopter, where they reveal their true plan:
So they pretend that Lois had killed Lana, who secretly hides out on Vulture Island while the trial is on-going, and plans to rescue her friend at the last minute by coming forward to prove she had not been killed after all. Lois is indeed sentenced to death. Of course, as is almost cliche in these stories, something goes wrong (Lana has a boating accident while returning from the island and is knocked unconscious), and it looks like Lois will actually be executed. Fortunately Superman saves the day (with a little help from mermaid Lori Lemaris), and at the end, Lois and Lana celebrate as the "barbaric custom" is banned in Star City.
However, DC did not get away with it scott-free. Check out this letter to the editor, which appeared a few issues later:
I agree to a certain extent with both the editor and Mrs Burke on this one. I do think Lois' opposition to the death penalty was largely just a plot device to create an interesting story. However the bit about "most people" considering capital punishment a "barbaric custom" does seem a bit over the top.