In his Kovetz Ma’amarim, Rav Elchonon Wasserman quotes what the Chofetz Chaim told him regarding the Yevsektsiya, the Jewish Communists who conducted a reign of terror against Judaism and religious Jews in early 20th-century Russia: “Bei mir iz barur az zay zenen foon zera Amalek — it’s clear to me that they descend from Amalek.”