A babygrow emblazoned with the slogan “I love Htlr” was one of the more egregious items Simon Knittel came across when he started delving into the murky world of Nazi merchandise. Knittel, executive creative director of the German advertising agency Jung von Matt, decided to take the bull by the horns and apply his creative mind to come up with a practical solution to the proliferation of far-right merchandise carrying Nazi slogans, but with their vowels removed to keep them within Germany’s postwar laws. Found on everything from boxer shorts to beer mugs, T-shirts to cushions, hoodies to spectacle cases,...