In 1995 Gillen, as Officer Commanding of the IRA's Belfast Brigade, was a member of the IRA Executive and was critical of the strategy employed by Gerry Adams. In 1997, he was elected to the Army Council with the backing of Adams, after he backed the leadership over dissident republicans who wished to steer the IRA in a more hardline direction.
In 2000, Gillen, along with Adams, Martin McGuinness, Pat Doherty and Brian Keenan were issued with a subpoena, in order to appear at Northern Ireland High Court as part of a civil action which was taken by relatives of the 29 Omagh bombing victims.
- Gillen age given as 58 as of 8 September 2015, irishtimes.com; accessed 24 September 2015.
- Guardian article
- Sinn Fein leaders ordered to court, scotsman.com; accessed 24 September 2015.
- "Collusion - Transcript of BBC Panorama programme". CAIN. 19 July 2002. Retrieved 25 September 2007.
- Moloney, Ed (2002). A Secret History of the IRA. Penguin Books. pp. 438–439. ISBN 0-14-101041-X.
- A Secret History of the IRA, pp. 477-479.
- Adams is subpoenaed by Omagh relatives to appear at civil action, irishtimes.com; accessed 24 September 2015.
- Brian Gillen, ex-Belfast Brigade boss, sued police over assault, belfasttelegraph.co.uk; accessed 24 September 2015.
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