Upvote:5
There is a difference between speaking a language and being fluent in it. In any case, Marx published books and articles in German, English and French. Engels writes that whole pages of βDas Kapitalβ were entirely in English and had to be translated into German for the published version. Marxβs letters to Engels swerve back and forth between German and English. Marx learned Russian and probably other European languages. He also commanded Greek and Latin. His PhD thesis is about the Greek philosophers Democritus and Epicurus, and he quotes the ancient sources in the original Greek and Latin.