The Thompson is an American submachine gun colloquially known as a "tommygun" that was used in World War II. It was first used by an agent in Madness Antipathy before Hank shot him in the head with a Beretta 92. Hank later used it himself to kill agents before surrendering it after being caught from behind by another agent.
It also appears in Madness: Project Nexus (Classic) with a buttstock and a foregrip.
The Thompson returns to the sequel, MADNESS: Project Nexus, as the Tenured .45 Submachinegun or simply TN45 and is mostly unchanged from the previous game, apart from a more stripped appearance. It is an uncommon SMG in the campaign apart from being Deimos's starting weapon for his Loadout "B". In Arena, it can be purchased for use from the Quartermaster upon the completion of either Slaughter Time or Haunting of Nevada House. It can also be fitted with a 60 round drum magazine and a stock at the modification stations. This version of the TN45 is also seen in use by Button Men During The Goods.