A nickname for Louisiana Gov. Huey Long because of his larger-than-life status in Louisiana. He was assassinated in 1935.
The Social Security website states that: “A farm boy from the piney woods of North Louisiana, he was colorful, charismatic, controversial, and always just skating on the edge. He gave himself the nickname “Kingfish” because, he said, “I’m a small fish here in Washington. But I’m the Kingfish to the folks down in Louisiana.”