German radical Rudolf Rocker was one of the most prominent figures of the anarcho-syndicalist movement during the classical period. His works such as Nationalism and Culture (as well as works of literary criticism like The Six) also made him anarcho-syndicalism’s most noted intellectual in the Anglophone world. A polyglot, Rocker learned Yiddish and became a well-known organizer of Jewish workers when he lived in London.
Lesser known is Rocker’s work as a translator, and his most interesting work was a Yiddish translation of Friedrich Nietzsche’s Thus Spoke Zarathustra. The Yiddish edition can be read online here.
Some of his Rocker’s works in Yiddish are available here as well.
(Special thanks to the Russian anarchist blogger Laplandian for finding these resources.)