In the series premiere episode, O'Hara tries to nail a rackets boss on charges of income tax evasion.
This time, O'Hara is out to bust up a gun smuggling operation.
O'Hara goes undercover as a truck driver in order to recover stolen explosives.
O'Hara tries to set up a crime boss by convincing him that he's on the take.
O'Hara poses as an arms dealer to find the source of new machine guns that are ending up in the hands of criminals.
O'Hara gets an uneasy feeling when he accompanies a diamond broker to Africa to investigate a diamond smuggling ring.
O'Hara must build an income tax evasion case against a con man who specializes in art swindles.
O'Hara must find a missing counterfeiter before vengeful racketeers do.
The bitter wife of a mobster sets hubby up for a fall but at the same time she endangers O'Hara.
O'Hara goes undercover as a dealer in a casino to prove that its owner is hiding cash from the IRS.