Mr. Martini works in the mafia with his old friend, Mr. Fontaine. Together, they operate out of Sam's Pub, but there is never any other business and neither of them seem to worry about what Sam thinks.
Even though they're in the mafia, they're never violent or mean to either Cory or Shawn. They compliment Cory's cappuchino and respectfully allow him to quit when he wants to. Even so, they do influence the boys with pressure.
On Christmas Eve, Mr. Martini and Mr. Fontaine ask Shawn to wait at corner in front of a warehouse, deliver a box, recieve an envelope, then return it to them for $200. Shawn initially agrees to do this, but Cory convinces him to stop and go home.