|Frank de Kova||Arnold "Boss" Faber|
|Alex Cord||Ed Haynes|
|Cal Bellini||Jerry Sessions|
|Ayn Ruymen||Lorrie Faber|
|Carmen Argenziano||Ernie Ligot|
|Edward Colmans||The Counselor|
|Donna Bacala||Helen Sessions|
|Mark Dana||Clayton McGregor|
|Edward Du Domaine||Weller|
|Lloyd Battista||Rollie Cardwell|
|Joe E. Tata||Stan Kuyler|
|John Aprea||1st Thug|
|John Graham||Bank Manager|
|Directed by: Robert Douglas
Written by: Robert Heverly
216. Night of the Long Knives
Original air date: 25 March 1973
This episode was not rerun
Suspecting assassinations in the Mafia are being planned, Inspector Erskine goes undercover as a caterer at the wedding of a mob boss's daughter. He hopes to find out what’s behind a ruthless lieutenant’s plans to kill the boss and take over the organization.
- Frank de Kova (1910-81) makes the first of two appearances on The FBI, as a mob boss. His second would be in the final season.
- Alex Cord (born Alex Viespi in 1931) had debuted in 1962's The Chapman Report. That movie starred Efrem Zimbalist Jr. Mr. Cord went on to make the Gene Rodenberry-penned Genesis II later in 1973.