You can setup "group whispers" by making a character where various player's are given control. Any whispers sent to that character can be seen by everyone given control of that character. It could be used to only whisper player's that know a given language. ie add a character named "dwarven", assign control to each player who's character speaks dwarven. Then "/w dwarven blah, blah, blah..." will only be seen by the dwarven group. But that doesn't seem to be related to your issue... player's communicating outside the GM's knowledge. The GM can add themselves to the permissions of each character so you would also get any whispers between characters. But determined/creative player's can always find other methods to communicate privately. There is also an API script(pro users) <a href="https://app.roll20.net/forum/permalink/4249037/" rel="nofollow">https://app.roll20.net/forum/permalink/4249037/</a>