Ah, I see how you could misunderstand. In context, this sentence was contrasting between those who knew, and those who didn't know about the fraud. To make my p

Ah, I see how you could misunderstand. In context, this sentence was contrasting between those who knew, and those who didn't know about the fraud. To make my point more clear: It's impossible that none of them knew. It's possible that some of them didn't know.