- May be the only Jewish actor to have played Adolf Hitler three times - in The Desert Fox, The Magic Face and The Twilight Zone.
- When his older sister Stella Adler went to Hollywood and signed with Metro-Goldwyn-Mayer, the studio changed her name to Stella Ardler. Luther, whose acting career was primarily on the stage, asked her why M.G.M. hadn't changed her name to Beverly Wilshire.
- One of six children of Jacob P. Adler
- Brother of Jay Adler and Stella Adler.
- Granduncle of Tom Oppenheim (the son of Ellen Adler).
- Uncle of Ellen Adler.
- Biography in: "The Scribner Encyclopedia of American Lives". Volume One, 1981-1985, pages 7-9. New York: Charles Scribner's Sons, 1998.
- He was a lifelong liberal Democrat.
- He has an entry in Jean Tulard's 'Dictionnaire du Cinéma/Les Acteurs' published in Paris in 2007 by Robert Laffont/Bouquins (pg. 12).
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