He deals with gangsters every day and knows for sure how to punish them! He has been putting gangsters to prison bars for 17 years! Barry has many enemies but he is not the one who scares easily.
On the Host’s command, you will take off your mask and point a finger on one of the players. If he is the Mafia, the Host “puts” him into prison (the player doesn’t vote and doesn’t shoot at Night).
When the Jailer dies, all the Mafia come back to the game from the prison.