Witness to the Mob is a television film which premiered on Sunday, May 10, and concluded on Monday, May 11, 1998.

Based on a true story, the film follows the rise of Sammy "The Bull" Gravano in the ranks of the Gambino crime family, one of the "Five Families" of the New York Cosa Nostra, culminating in his becoming underboss to John Gotti, his decision to betray Gotti by testifying in the fourth and final trial that saw him sentenced to life imprisonment and his life in the Witness Protection Program.

• Nicholas Turturro as Sammy Gravano
• Tom Sizemore as John Gotti
• Debi Mazar as Deborah Gravano
• Abe Vigoda as Paul Castellano
• Philip Baker Hall as Salvatore "Toddo" Aurello
• Frank Vincent as Frank DeCicco
• Lenny Venito as Sal DiMaggio
• Johnny Williams as Angelo Ruggiero
• Frankie Valli as Frank LoCascio
• Michael Imperioli as Louie Milito
• Vincent Pastore as Michael DeBatt
• Peter McRobbie as George Pape (based on Gerard Pappa)
• Nicholas Kepros as Vincent "The Chin" (Vincent Gigante)
• Michael Ryan Segal as Nicky Cowboy (Nicholas Mormando)
• Tony Sirico as Tommy Gambino (Thomas Gambino)
• Richard Bright as Joseph Paruta
• Richard E. Council as Louie DiBono (Louis DiBono)
• Peter Appel as Eddie Garofal (Edward Garofalo)
• Gerard Cordero as Wiseguy #1
• Tony Kruk as Di Bernardo (Robert DiBernardo)
• Stephen Payne as Bosko Radonjich
• Leonardo Cimino as Neil Dellacroce
• Arthur Nascarella as Bruce Mouw
• Gaetano LoGiudice as Gotti Bodyguard
• Kirk Acevedo as Nicholas Scibetta
• Joseph Siravo as Gene Gotti
• Kathrine Narducci as Linda Milito

The film was based on court records, FBI transcripts and news reports (rather than on the 1997 book Underboss written by Peter Maas).^[1]

Vincent Pastore, Tony Sirico, and Frank Vincent had all previously appeared in the 1996 film Gotti, which covered the same events, each playing a different character than they did in this movie.

• Witness to the Mob at IMDb