In 1917, the Bolshevik Party hijacked the Russian Revolution, consolidated power and almost immediately began targeting all forms of religious observance and communal life. With the zealous assistance of the Yevsektzia—the Jewish sections of the Bolshevik Party—this effort took on an accelerated pace in the Jewish community. Synagogues were closed, communal property confiscated and clergy attacked.

The Sixth Rebbe, Rabbi Yosef Yitzchak Schneersohn, succeeded his father as Lubavitcher Rebbe in 1920, becoming spiritual leader of the emerging Soviet Jewry. He established the Rabbinical Committee of the USSR and under its auspices built mikvah ritual baths, founded underground Jewish schools and yeshivahs, and trained rabbis and shochetim (ritual slaughterers) to serve as communal leaders throughout the Soviet Union.

For this work he was arrested in 1927 and sentenced to death. Rabbi Yosef Yitzchak was ultimately released and exiled from the Soviet Union, but would continue working on behalf of Soviet Jewry for the rest of his life. Even as conditions in the Soviet Union worsened, his network continued to grow.