- Country: UK
- Genres: Crime, Drama, Thriller
- Release: 1964-05-28
- Director: Robert Tronson
- Writers: Frank Launder , Peter Barnes
- Language: English
- Stars: Bernard Lee , William Sylvester , Margaret Tyzack , David Kossoff , Thorley Walters , Nancy Nevinson , Derek Francis , Hector Ross , George Pravda , Patrick Barr
- Runtime: 90 min
- Awards: N/A
- AKA: 003 contro Intelligence Service (Italy) , Circulo de espias (Colombia) , Casuslar Çemberi (Turkey) , Ring of Spies (Australia) , Reţeaua trădării (Romania) , Lov za listino prekletih (Slovenia) , Kémek gyűrűjében (Hungary) , Senca izdaje (Slovenia) , Spionnen fabriek (Belgium) , Ring of Spies (United Kingdom) , Fabrique d'espions (France, French Republic) , Den röde agenten (Sweden) , Shadow of Treason (United States of America) , Ring of Treason (Canada) , Circulo de espias (Mexico) , Circulo de espias (Chile) , Circulo de espias (Venezuela) , Ring of Treason (United States of America) , Vakoojien piiri (Finland) , Circulo de espias (Argentina) , Fabrique d'espions (Belgium) , Spionringen (Denmark) , Reţea de spioni (Romania) , To 13o kleidi (Greece) , Ring of Spies (Ireland) , Ring of Spies , Spionnen fabriek (Netherlands the) , BM15必死の潜行 (Japan)
- Plot: The film is based on the actual events of the Portland Spy Ring trial in the U.K. A disgruntled Navy Clerk is transferred to a secret research establishment and is subsequently black-mailed/paid by Czech intelligence to procure secrets for them. He seduces the secretary who controls the most secret documents, and they enjoy the fruits of their treachery until the British authorities begin to close in on them.
- IMDB:tt0057458
Ring of Treason Cast · · · ALL
Robert Tronson
Director
Bernard Lee
Henry Houghton
William Sylvester
Gordon Lonsdale
Margaret Tyzack
Elizabeth Gee
David Kossoff
Peter Kroger
Nancy Nevinson
Helen Kroger
Thorley Walters
Cmdr. Winters
Gillian Lewis
Marjorie Shaw
Newton Blick
P.O. Meadows
Philip Latham
Captain Ray
Cyril Chamberlain
Anderson
Justine Lord
Christina
Patrick Barr
Captain Warner
Derek Francis
Chief Supt. Croft
Hector Ross
Supt. Woods
Paul Eddington
Johnnie
Richard Marner
Colonel Monat
Geoffrey Palmer
Police Officer
André Mikhelson
Russian Embassy official
Garry Marsh
First Member at Lords
Basil Dignam
Second Member at Lords
Brian Nissen
Portland official
Edwin Apps
Blake
Fred Griffiths
News vendor
Anita West
Tilly