Nehemiah Persoff was no stranger to playing gangsters. One of his best-known roles is the crime boss Little Bonaparte in the movie Some Like It Hot (1959).
Harry Wilson, who briefly shares a scene as a gangster henchman with the crime boss Nehemiah Persoff plays in this episode of The Untouchables (1959), also shares a scene with Nehemiah Persoff, again playing a crime boss, in the movie Some Like It Hot (1959).
This is the second of 20 appearances Frank Wilcox makes in this series, each time playing Federal DA Beecher Asbury. While still appearing in this series, he took on the recurring role of oilman John Brewster, a role he is perhaps best remembered for, in the hit TV sitcom The Beverly Hillbillies (1962).
This is the first of six appearances Nehemiah Persoff makes in the series and the first of three appearances in the role of Jake Guzik.
This is the first of five appearances Carl Milletaire makes in the series. Each of his first two appearances put him in a different role. His last three appearances put him in the role of gangster Pete Konitz, one of Frank Nitti's henchmen.