S. An-sky

Shloyme Zanvl Rappoport (1863 – November 8, 1920), also known by his pen name S. An-sky, was a Jewish author, playwright, researcher of Jewish folklore, polemicist, and cultural and political activist. He is best known for his play ''The Dybbuk'' or ''Between Two Worlds'', written in 1914, and for Di Shvue, the anthem of the Jewish socialist Bund. In 1912-1914, he led the Jewish Ethnographic Expedition to the Pale of Settlement.

In 1917, after the Russian Revolution, he was elected to the Russian Constituent Assembly as a Social-Revolutionary deputy. Provided by Wikipedia