In examining the material, one is immediately struck by both the magnitude of the investigation and the size and types of records generated by it. To a great extent, the records have been organized following the filing system and order established by SUS, as is customary in archival practice. Series titles have been retained except in a few cases when they seemed confusing or misleading.
Significant duplication shows up throughout the records.
That is, a particular report or interview may appear in several aspects of the investigation. In order to document this practice, such duplication has not been eliminated unless it occurred within the same file unit. The records are divided into four distinct groups. The largest group by far consists of the records of Special Unit Senator, 1968-1969, which conducted the investigation. The second group is relatively small in comparison, but significant.