Social Rules
The Vigilante...a total wild card...he can kill once per game by sending me a PM at the start of the game night. The Vigilante can be an Innocent or a Mafia, and strike against either.
The mafia are allowed talk amongst each other.
This is a rules question; if the vigilante is mafia is this know amongst the mafia. The quote above suggests the vigilante can be innocent or a mafia. That says to me that if he's mafia that is known to the mafia.
But I may be wrong...Perhaps rbishop could clarify this EDIT IF it is an ambiguity in the rules. All we need to know is whether the vigilante, if mafia, is part of the mafia mob, or appears innocent to all persons even if investigated, by either side, and if mafia that this is unknown to the mafia.
I say if it is an ambiguity, because perhaps we are not meant to know the answer.