The Westies

J.K. Simmons

Eamon Sweeney

Titus Welliver

Glenn Keenan

Tom Brittney

James 'Jimmy' Roarke

Stanley Morgan

Mickey Flanagan

Sarah Bolger

Bridget Walsh

Jessica Frances Dukes

Agent Birdie Polk

Hamish Allan-Headley

John Gotti

Vincent Walsh

Eddie Breen

Allen Leech

Brendan Cahill

Hilary McCormack

Erin Malone

Michael Rispoli

Vinnie Zaccaro

Aidan Wojtak-Hissong

Danny Keenan

Adam O'Byrne

Deke Kinsella

John Bourgeois

Ray Quinlan

Dan Reilly

Davey O'Brien

Dylan Taylor

Connor

Jeremy Walmsley

Pat

Tamsin Kelsey

O'Brien's Mother