- Country: UK
- Genres: Crime, Drama, Thriller
- Release: 1952-05-20
- Director: Roy Boulting
- Writers: Frank Harvey , Roy Boulting
- Language: English
- Stars: Liam Redmond , André Morell , Kenneth Griffith , Anthony Bushell , Mary Morris , Joan Hickson , Anthony Nicholls (I) (1902–1977) , Geoffrey Keen , John Bailey , Patric Doonan
- Runtime: 90 min
- Awards: N/A
- AKA: Den usynlige fjende (Denmark) , High Treason (United Kingdom) , Eshati prodosia (Greece) , Haute trahison (France, French Republic) , High Treason , Alta traición (Spain) , High Treason (United States of America) , Valtiopetos (Finland) , SOS Scotland Yard (Italy) , Högförräderi (Sweden) , 反逆(1951) (Japan) , Teia de Sabotagem (Brazil) , Alta Traição (Portugal, Portuguese Republic)
- Plot: A wave of sabotage has been sweeping England, taking lives and creating instability. Cmdr. Robert Brennan and Supt. Folland of the Special Branch and Major Elliott of MI5 are charged with putting an end to this internal terrorism.
- IMDB:tt0043637
High Treason Cast · · · ALL
Roy Boulting
Director
Liam Redmond
Cmdr. Robert Brennan
André Morell
Supt. Folland
Kenneth Griffith
Jimmy Ellis
Anthony Bushell
Maj. Elliott
Mary Morris
Anna Braun
Joan Hickson
Mrs. Ellis
Anthony Nicholls
(I)
(1902–1977)
Grant Mansfield
Geoffrey Keen
Morgan Williams
John Bailey
Stringer
Patric Doonan
George Ellis
Dora Bryan
Mrs. Bowers
Stuart Lindsell
Commissioner
Charles Lloyd Pack
Laurence Naismith
Jack McNaughton
Julian Amyes
Alfie Bass
Basil Cunard
Harry Fowler
Everley Gregg
Glyn Houston
Douglas Ives
Moultrie Kelsall
Sam Kydd
Victor Maddern