I was part of the Special Inquiry Unit in the eighties. The files and summaries for these investigations go into a huge old rotor file that was under the sole control of JEdgar. This guy sure as hell got referenced in a load of bufiles, looking at the search slips.
FBI record on Thomas dAlesandro:
https://vault.fbi.gov/thomas-dalesandro-jr/thomas-d-alesandro-jr.-part-01-of-01/view