Two four letter words are clean as a whistle until placed side by side.
‘Karl’ could be just another guy, like George Karl, the NBA coach, Karl Malden…or maybe Karl Rove.
‘Marx’ could be Groucho, Harpo, Chico, or maybe Richard. Or it could be mistaken for the word ‘marks’ as in grades in school. Or for targets, as in ‘marksmanship’.
Each name by itself has four letters but is not yet a four-letter word. Either can be spoken out loud. But speak the two together, as in ‘Karl Marx’, and heads will turn, fingers will wag, charges will be brought, electronic ears will be listening.
It’s popular to be a Groucho, Harpo, Chico, or Richard. It’s not so safe if your name is Karl, unless your last name happens to be Rove.
The older Karl grew up in a white house in Trier, Germany, but he never occupied the White House