If you check the NARA catalog entries for the topic "Detention of persons" (https://catalog.archives.gov/id/10640519 ), you will see that there are 27 entries... Publication M1500 "Records of the Special Boards of Inquiry, District no. 4 (Philadelphia), 1893-1909" is the only BSI hearings collection.
Regards,
David Oseas
Researching:
HYMAN/HEYMAN/HEIMOWITS/CHAJMOVITS: Zemplen-Dobra, Hungary > New York
KLEIN: Satoraljaujhely (Ujhely), Hungary > New York > Los Angeles
KRONOWITH: Hungary > New York
OSEAS/OSIAS/OSIASI/OZIAS: Iasi, Romania > Chicago > Milwaukee > Los Angeles
SCHECHTER/SHEKTER: Kishinev, Bessarabia > New York
SHERMAN: Iasi, Romania > New York > Los Angeles
STRUL: Iasi, Romania > Haifa, Israel
WICHMAN: Syczkowo (Bobruisk), Belarus > Milwaukee > Los Angeles
