The Four Men of the title are British WWI veterans who decide to work secretly against enemies of the country. They aren't above a bit of murder or sabotage to serve their ends, but they consider themselves to be true patriots.
Hugh Sinclair
Humphrey Mansfield
Griffith Jones
James Brodie
Francis L. Sullivan
Leon Poiccard
Frank Lawton
James Terry
Anna Lee
Ann Lodge
Alan Napier
Sir Hamar Ryman M.P.
Basil Sydney
Frank Snell
Lydia Sherwood
Myra Hastings
Edward Chapman
B.J. Burrell
Athole Stewart
Police Commissioner
George Merritt
Inspector Falmouth
Garry Marsh
Bill Grant
Straw Dogs
La cosecha
Safe and Sound
The Basement
Kanyakumari Express
Murder Van
The Clinic
The Big Sick
Harry Potter and the Philosopher's Stone
Joker
1917
Doctor Strange
Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)
Terribly Happy
Parmanu: The Story of Pokhran
The Wicked Gift
Deadpool
Spider-Man: Far From Home
Guardians of the Galaxy Vol. 2
Frozen II