B'nai B'rith
From 1901 on, Schorr was a member of the humanitarian society B'nai B'rith "Leopolis" in Lwów, where for a few years he led the library. The B'nai B'rith "Leopolis" was founded in 1889 and since 1932 had its own building at 3 Maja street, 10. The archival documentation of B'nai B'rith "Leopolis" has been partially preserved and is still to be studied. From 1922 "Leopolis" was incorporated into the 13th district of B'nai B'rith Poland and numbered 217 persons, the largest lodge in Poland.