Law & Order: Season 1, Episode 15 - ProjectFreeTV

1 - 15: The Torrents of Greed, Part 1

Detectives arrest three members of the Masucci crime family involved in a fatal assault, which leads to Stone attempting to use the arrest as a means to take down the entire Masucci crime syndicate via charging Mafia chieftain Frank Masucci. However, the plan backfires when Stone discovers that his chief witness (one of the three charged in the fatal assault) perjures himself on the stand, leading to Masucci's acquittal.