kingfish noun a powerful or political figure US,1926 Predates but influenced by the adoption as a nickname for the governor of Louisiana, Huey P. Long (1893–1935).
Warring is kingfish of Georgetown. He controls its local police precinct as well as its local crime — Jack Lait and Lee Mortimer, Washington Confidential, p. 10, 1951
I’ll do a dead-on Kingfish voice as O.J. [Simpson][.] — Howard Stern, MissAmerica, p. 138, 1995