MI5/B Branch

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B Branch is the division of MI5 responsible for personnel, security and training.[1]

History

In 1929, an early incarnation of B Branch was responsible for 'investigations and inquiries'.[2]

Following a 1938 re-organisation, B Branch acquired responsibility for counter-espionage and counter-subversion.[3]

In Dick White's 1953 re-organisation of the service, B Branch became responsible for personnel and establishments.[4]

Organisation

Sections

  • B1: Protective security for MI5 including building security and staff vetting.
  • B2: Personnel.
  • B7: Training and recruitment.[5]

Notes

  1. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.865.
  2. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.127.
  3. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.134.
  4. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.327.
  5. Mark Hollingsworth and Nick Fielding, Defending the Realm: Inside MI5 and The War on Terrorism, André Deutsch, 2003, pp.320-321.