Vinnie informs Mike that the Mafia (likely the Leone Family) want a local drug pusher, Federico, taken out for using more of their product than he sells. Mike, realising he needs a weapon, heads to Ammu-Nation and purchases a pistol. He then chases down Federico, who is in Trenton. Mike kills Federico and is paged by Vinnie, asking him to return to the restaurant.
Post Mission Pager Message
Come back to the restaurant, Mike. We need to secure transportation. Vinnie.
The guys upstairs say they could use a hand with a small-time pusher named Federico. He's been using more of their product than selling it which is bad for business. Take him out and the Mafia will help us.