Severus informs him that they will speak again on this later, and strides out without so much as a ‘by your leave.’

The folders’ contents are chilling.  

Tom M. Riddle.  
Raised in an orphanage.
Requested to stay at Hogwarts no fewer than 10 times.
Slytherin
Most Known Profession:  Dark Lord

Albus flips ahead a few pages and finds another name he recognises.  

Bellatrix Black
Raised in an abusive home
Requested to stay at Hogwarts no fewer than 5 times
Slytherin
Most Known Profession:  Death Eater

The contents of the folder is vast.  He pulls up another page with some surprise.

Gaspard Shingleton
Raised by an abusive father.
Requested to stay at Hogwarts no fewer than 25 times.
Slytherin
Most Known Profession:  Inventor of self-stirring cauldron
Least Known Profession:  Death Eater, killed in 1979

The great majority of the folder are dead; killed long before their time should have ended.   

Donaghan Tremlett
Abandoned to the wilds as a child
Requested to stay at Hogwarts no fewer than 7 times, eventually was moved in with Hagrid until school days were finished
Gryffindor
Most Known Profession:  Bass player for Weird Sisters

A note is attached to Donaghan’s page, and it catches Albus’ eye.