Green Mask (Ace)

Origin
Sam Barkley was a famous sportsman who secretly harbored dreams of world domination. When his American father left his foreign mother, Sam's mother taught him to hate everything about the United States. As the Green Mask he was willing to resort to murder and kidnapping to destroy America. He carried a gun, and led a gang which included his girlfriend, Lili Damora. He was stopped by Secret Agent X, but he decided to kill himself with a capsule of purric acid rather than be captured.

Golden Age Comic Appearances
Sure Fire Comics vol. 1 #1 (June, 1940)