Crossword Genius

Karl or Groucho? (4)

Ross

I believe the answer is:

marx

(Other definitions for marx that I've seen before include "Groucho --, comic" , "Groucho, Harpo, Chico, Zeppo, Gummo - or Karl?" , "Communist founder" , "Karl, top communist" , "The Economist" .)

I've seen this clue in The A.V Club.
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