Arrested by the NKVD , he was sent to a gulag , and later released .
When Lwow was annexed by the Soviet Union , Sommerstein organized the Committee of Helping Jewish Refugees from Germany .
Arrested by the NKVD , Sommerstein was sent to a gulag , and later released .
When Lwow was annexed by the Soviet Union , Sommerstein organized the Committee of Helping Jewish Refugees from Germany .