| Warren Beatty | John Reed | |
| Edward Herrmann | Max Eastman | |
| Jack Nicholson | Eugene O'Neill | |
| Maureen Stapleton | Emma Goldman | |
| M. Emmet Walsh | Speaker - Liberal Club | |
| Bessie Love | Mrs. Partlow |
| Diane Keaton | Louise Bryant | |
| Jerzy Kosinski | Grigory Zinoviev | |
| Paul Sorvino | Louis Fraina | |
| Nicolas Coster | Paul Trullinger | |
| Ian Wolfe | Mr. Partlow | |
| MacIntyre Dixon | Carl Walters |