Mike D'Angelo played by Louis Cancelmi, is an FBI agent working deep undercover in Al Capone's criminal organisation in Chicago. His real identity is Agent Mike Malone.
- Al Capone: Employer (undercover)
- Elliott Ness: Actual Employer
- Nelson Van Alden: Colleague, murder victim (deceased)
- Eli Thompson: Colleague
|Season five appearances|
|Golden Days for Boys and Girls||The Good Listener||What Jesus Said||Cuanto|
|King of Norway||Devil You Know||Friendless Child||Eldorado|