Anonymous boasts of itself as being a loose collective, a patchwork of mixed, at times conflicting ideals, sans leadership. It seems to work well for them! Except this nebulousness also lets in pretty much anyone. Including the cops.
MSNBC reports the recent rash of Anonymous arrests, spanning Spain and South America, can be traced back to a single chat room. And this chatroom, like pretty much all of Anonymous' chatrooms, were ripe for monitoring: