 In Canada, a similar group was known as the Proletariat school of writers, exemplified by Yudica.In the Soviet Union, Yiddish literature underwent a dramatic flowering, with such greats as David Bergelson, Der Nister, Peretz Markish and Moyshe Kulbak.Several of these writers were murdered during a Stalinist purge known as the Night of the Murdered Poets (August 12–13, 1952), including Itzik Fefer and Leib Kvitko.