Career
He headed the Jewish community in Latvia until 1940, when it was annexed by the Union of the Soviet Socialist Republics. Due to his efforts, the imprisonment of the famous "Lubavitcher" Rebbe Yosef Yitzchok Schneersohn in the Union of the Soviet Socialist Republics in 1927 was commuted to exile in Latvia. Dubin was deported from Latvia by the Soviet authorities in 1940 and released in 1942. After World World War II he returned to Riga where the local press attacked him violently, of course under orders from above.
He was arrested again and deported in 1948.
He lived under arrest and exile in Siberia, first in Samara, and later in Tula, where he died in 1956 in a labor camp and is buried.