To help untangle this puzzle, I spent some time this weekend making a master roster of all the personnel in the setting, cross-indexed by described role and location day and night (as well as gender and nationality, as noted for their highest language score).
One thing this really highlights is how the module is designed as a mystery for the reader. Most of the street-level locations and personnel appear generally innocent, or with at most some arch foreshadowing; whereas when they appear in the below-street level section key, their dark secrets are revealed. In many cases, particularly for members of Amontillado Alley this runs on some pun on their above-ground role (the printer is a counterfeiter, the butcher a surgeon, the gypsy palm reader a seller of surveillance gear, the cobbler who helps you walk properly procures motor vehicles, etc.). Also, the numerical area codes for this area are usually synchronized from above-to-below ground (I never noticed that before).
The personnel codes are clearly not completely uniform in their usage. Here's the best pattern-making that I could make with them:
Groups in Sprechenhaltestelle
- A: Amontillado Alley personnel and assistants (mostly)
- B: Busboy, barber, beautician, butcher (mostly)
- C: No recognizable pattern?
- D: Detention (mostly)
- G: Guards at warehouses
- S: Surface personnel (some associated with AA)
- U: Underground personnel (at Pair-A-Dice)
- W: Waitresses (mostly)
- X, Y, Z: Civilians not associated with spycraft (leave town at night, no contacts or code phrases)
- L1: Launderer
- R1: Waiter (?)
- WS1: Wine steward
- HC: Hotel cook
- HD: Hotel dishwasher
- HSO: Hotel switchboard operator
- NSO: Nighttime switchboard operator
- WCS: Wood carving sailor, a.k.a. wino, crazed in sewer.
Below, you'll find links to the complete roster that I compiled. Not everything got filled; there are a number of NPC's for whom I could find no description of their role at all in the key (notably: C2, C3, C15, S2, S4, and S120). A few others didn't specify where they spend their nights (S1, HD), and many didn't specify a particular gender. Another thing that could be added here (if I was going to run the adventure) would be random names based on their observed nationality (again, inferred from their best language score; see Top Secret rulebook p. 6, all-caps section: native fluency must be scored highest).
Can you fill in the missing roles for those mystery personnel (perhaps by doing some detective work with the contacts list)? Can you see any pattern for the "C" personnel that I'm missing?