They do not want you to know they even exist.
That is why you do not know why they are in all the banks in the world.
Just because you were in banking it does not neccesarily mean you needed to know the history of banking here in the US or the world.
Where I used to work, I did not know the owner of the company was connected to the maffia until I looked into his history after hearing stories about him.
After finding that out, I quit.