Many of the forgotten names of the era are contained in a memorandum sent to FBIHQ by SAC Melvin Purvis, Chicago Division.  In this July, 1934 memo we can see how the Chicago Office is staffed and who is assigned which investigations in general. 

 Inspector Sam Cowley (left) and SA Herman Hollis; both killed in the line of duty at Chicago

Inspector Sam Cowley (left) and SA Herman Hollis; both killed in the line of duty at Chicago