Frölich is best remembered as a pioneer biographer of the assassinated Communist Rosa Luxemburg, with his book on her translated into a number of languages, including Spanish, English, French, Italian, Slovenian, Korean, Greek, Hebrew, and Japanese.
Frölich is best remembered as a pioneer biographer of the assassinated Communist Rosa Luxemburg including Spanish, English, French, Italian, Slovenian, Korean, Greek, Hebrew, and Japanese. This was with his book on her. This was translated into a number of languages.