Is there an idiom that means "without anyone noticing"? I am trying to remember the idiom that meant something similar to that, but I can't remember what it was exactly.
For example:
They decided to destroy all researches that supported the wrong view, and by thus doing they were able to create a crisis without the organization noticing anything wrong until it was too late.
This is the best way I can think of of saying it, but I remember there was a really good idiom, but I don't remember it.
