 Schneersohn was born June 21, 1880 (12 Tammuz 5640).The day is marked by public gatherings, additional study and prayer.On Wednesday, June 15, 1927 (Sivan 15, 5687) Rabbi Yosef Yitzchak Schneersohn, the sixth Rebbe of the Chabad Hasidic movement, was arrested and incarcerated by the Soviet communist regime for "counter-revolutionary activities".