Editing Double-Cross System (section)

==List of agents==
MI5 recorded approximately 120 Double-Cross agents.{{r|Masterman|p=190}} This list includes those agents whose real identities have been released.
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* ''Artist'' – [[Johnny Jebsen]]<ref name=Macintyre83/>
* ''Balloon'' – [[Dickie Metcalf]]<ref name=hervie>{{Cite book|last=Haufler|first=Hervie|url=https://books.google.com/books?id=ySErAwAAQBAJ|title=The Spies Who Never Were: The True Story of the Nazi Spies Who Were Actually Allied Double Agents|date=2014-04-01|publisher=Open Road Media|isbn=978-1-4976-2262-3|language=en}}</ref>
* ''Biscuit'' – [[Sam McCarthy (spy)|Sam McCarthy]]<ref name=hervie />
* ''Bronx'' – [[Elvira Chaudoir]]<ref name="mag">{{cite book|title=Wonder Women: 25 Innovators, Inventors, and Trailblazers Who Changed History|last=Maggs|first=Sam|year=2016|publisher=Quirk Books|isbn=9781594749254|page=112}}</ref>
* ''Brutus'' – [[Roman Czerniawski]]<ref name=Masterman/>
* ''Celery'' – [[Walter Dicketts]]<ref name=hervie />
* ''Cheese'' – Renato Levi, Italian [[Servizio Informazioni Militare]] agent<ref name=hervie />
* ''Dreadnaught'' – [[Ivan Popov (spy)|Ivan Popov]], brother of Dušan Popov, ''Tricycle''<ref name=Popov/>{{rp|193}}
* ''Fido'' – [[Roger Grosjean]]<ref>{{cite journal | author=Grosjean, F. | title=FIDO: French pilot and Security Service double agent malgré lui | year=2010 | journal=International Journal of Intelligence and CounterIntelligence | issue=2 | pages=337–352 | volume=23 | doi=10.1080/08850600903348879| s2cid=154793196 }}</ref>
* ''Freak'' – [[Marquis Frano de Bona]]<ref name=hervie />
* ''Gala'' - Anna Agiraki<ref name=hervie />
* ''Garbo'' – [[Juan Pujol García]]<ref>{{cite book | last=Holt | first=T. | title=The Deceivers: Allied Military Deception in the Second World War | publisher=Scribner | year=2010 | isbn=978-1-4391-0388-3 | url=https://books.google.com/books?id=E569Q7s1CnsC | access-date=February 23, 2025 | page=210}}</ref>
* ''Gelatine'' – [[Gerda Sullivan]] (Friedl Gaertner)<ref name=hervie />
* ''Gilbert'' – [[André Latham]], jointly handled by SIS and the French [[Deuxième Bureau]]<ref name=hervie />
* ''GW'' – [[Gwilym Williams (spy)|Gwilym Williams]]<ref name=hervie />
* ''Hamlet'' – Dr Koestler, Austrian<ref name=hervie />
* ''La Chatte'' – [[Mathilde Carré]]<ref>{{cite book |last1=Walker |first1=Robyn |title=The Women who Spied for Britain |date=2014 |publisher=Amberley Publishing |location=Stroud, Gloucestershire |isbn=9781445623160 |pages=72–73}}</ref>
* ''Meteor'' – Tomas Sardelic<ref name=Popov/>{{rp|195}}
* ''Monoplane'' – [[Paul Jeannin]] 6th Army Group - French - prior codenames Jacques and Twit; German codename: Normandie. Former radio operator on the French liner Normandie.<ref>{{cite book |title=The Deceivers: Allied Military Deception in the Second World War |first=Thaddeus |last=Holt}}</ref>
* ''Mullet'' – Thornton, a Briton born in Belgium<ref name=hervie />
* ''[[Mutt and Jeff (spies)|Mutt and Jeff]]'' – Helge Moe and Tor Glad, two Norwegians<ref name="mi5">{{cite web |url=https://www.mi5.gov.uk/output/25-november-2002-releases-double-cross-agents.html |title=MI5 &#124; Double Cross Agents |work=mi5.gov.uk |year=2011 |accessdate=14 July 2012 |url-status=dead |archiveurl=https://web.archive.org/web/20110807140058/https://www.mi5.gov.uk/output/25-november-2002-releases-double-cross-agents.html |archivedate=7 August 2011 }}</ref>
* ''Puppet'' – Mr Fanto, Briton<ref name=hervie />
* ''Quicksilver'' - George Liossis<ref name=hervie />
* ''Rainbow'' – [[Günther Schütz|a man named Pierce]]<ref name=hervie />
* ''Snow'' – [[Arthur Owens]]<ref>{{cite book |last=Hayward |first=James |title=Double Agent Snow |year=2013 |publisher=Simon & Schuster Ltd |isbn=978-0857208545}}</ref>
* ''Summer'' – [[Gösta Caroli]]<ref>{{Cite book |last1=Degtev |first1=Dmitry |url=https://books.google.com/books?id=DDsTEAAAQBAJ&dq=G%C3%B6sta+Caroli&pg=PT35 |title=The Luftwaffe's Secret WWII Missions |last2=Zubov |first2=Dmitry |date=2020 |publisher=Air World |isbn=978-1-5267-7548-1 |language=en}}</ref>
* ''Tate'' – [[Wulf Schmidt]]<ref name=Masterman/>
* ''Treasure'' – [[Nathalie Sergueiew]] (Lily Sergeyev)<ref name=Masterman/>
* ''Tricycle'' – [[Dušan Popov]]<ref name="mi5"/>
* ''Watchdog'' – [[Werner von Janowski]]<ref>{{cite book|last=Beeby|first=Dean|title=Cargo of lies : the true story of a Nazi double-agent in Canada|url=https://archive.org/details/cargoofliestrues0000beeb|url-access=registration|year=1995|publisher=University of Toronto Press|location=Toronto|isbn=0-8020-0731-7}}</ref>
* ''Zigzag'' – [[Eddie Chapman]]<ref>{{Cite book |last=Macintyre 1963 |first=Ben |title=Agent Zigzag: the true wartime story of Eddie Chapman: lover, betrayer, hero, spy |year=2007 |language=en}}</ref>
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