With Al Capone out of the picture appealing his recent conviction, the Untouchables focus their attention on the number 2 gangster in Chicago, George 'Bugs' Moran. Federal officers soon have Moran under 24 hour, seven day a week surveillance. Moran has recently kidnapped young Larry Halloran, even though the mobster know that the boy's father has no money. What Moran wants is to get control of the union the elder Lawrence Halloran is in charge of. It's only a small truckers union but Moran would be more than happy to strong-arm businesses to sign contracts with the union and in turn provide the mob with a nice steady income. With Eliot Ness away in Washington at Congressional hearings, Agent Martin Flaherty is in charge of the investigation but Halloran isn't prepared to take the risk of setting up the big-time mobster for an arrest. Halloran tries to make a deal with a local trucking firm but ends up in the hospital during which time Moran gets control of the union.