

It sounds like a cursed item in D&D or something.
The Book of Faces Wondrous Item, very rare
This enchanted tome magically records the likeness each humanoid slain in its vicinity, preserving a snapshot of their life and memories. The book can be read to glean superficial information about it’s subjects. As an action, you can tear a page from the book to summon a ghostly spirit of its subject, which will be magically compelled to answer questions. The spirit knows nothing the owner did not know in life.
The Demon Lord Elgor Ithym is said to have a keen interest in this book…
It is too easy for most unions to become corrupted by self interested parties. It’s the same with any human endeavour. Relax the boundaries enough and people with less scruples than you will worm their way in.
There’s needs to be legislative framework that protects the rights of every worker, every industry, everywhere as a baseline. Then construct sensible unions for various industries from there. Otherwise they become fragile, susceptible to personal influence - who’s going to run against a 10 year incumbent union president?- it needs an iron core underlying it to protect workers rights.