Wolfgang von Strucker was a prominent Nazi, followed by a long stint of heading the terrorist organization Hydra.
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History
CREATORS: Stan Lee, Jack Kirby
FIRST (HISTORICAL) APPEARANCE: Sgt Fury and his Howling Commandos #5 (January, 1964)
FIRST (CHRONOLOGICAL) APPEARANCE: Gambit Vol 3 #10 (November, 1999)