National Archives Microfilm Publication M1085 “Investigative Case Files of the Bureau of Investigation, 1908-1922” is worth checking. Click on “View Important Publication Details” on the right side of the screen to retrieve the Descriptive Pamphlet; this contains the reel numbers for the name index and the case files themselves. The page also shows the various National Archives locations which have this microfilm available for viewing and printing.
FYI, the original case files and index were destroyed after they were microfilmed.
You can search for other National Archives microfilm publications here.
Thank you. I'll check into itKarl Koenig