Public inquiry finally confirm Mark Cassidy as an undercover police officer that infiltrated construction union UCATT

April 11, 2018

Undercover police officer HN15 = Mark Cassidy = Mark Jenner

The undercover policing public inquiry has finally confirmed that the joiner many of us knew as Mark Cassidy was in truth an undercover police officer. His real name is Mark Jenner and b

etween 1995-2000, he infiltrated the construction UCATT (his subs were paid from a bank account set up by Special Branch)


He also infiltrated rank and file groups including the Building Worker Safety Campaign, the meetings of which he chaired at the Colin Roach Centre in Hackney. Jenner / Cassidy also targeted RMT, Unison, CPSA, TGWU and was on numerous picketlines including Dahl Jenson at Waterloo, JJ Fastfoods at Tottenham Hale and L.B. Southwark DLO.


Mark Cassidy / Jenner was first publicly named in by an article by journalist & union activist Mark Metcalf and in Blacklisted book by Phil Chamberlain & Dave Smith. The Met Police issued a public apology to ‘Alison’, the activist he lived with during the five years of his deployment. It is shameful that the Met and the public inquiry have taken so long to admit that Mark Cassidy was an undercover police officer from the Special Demonstration Squad, something that everyone has known for years.


‘Alison’, Mark Metcalf, UCATT (now part of UNITE) and blacklisted workers Brian Higgins, John Jones, Steve Hedley, Frank Smith, Dan Gilman & Dave Smith (who attended meetings, protests and pickets with Mark Cassidy / Jenner) have all been granted core participant status in the undercover police public inquiry.


This public confirmation about Mark Cassidy comes just a week after the Met confirmed that police provided information to the building industry blacklist.


Blacklist Support Group send a huge hug to ‘Alison’ and all the women activist at Police Spies Out of Lives for their inspirational battle to force the authorities to tell the truth about the undercover police officers that abused them.

Full story on Mark Jenner:





Alison’s Statement in full:

“I welcome the Inquiry finally confirming that my former partner Mark Cassidy was an undercover police officer and that his name now appears on the UCPI website’s list of cover names. It is deeply disappointing, however, that it has taken the Inquiry so long to confirm a fact that we exposed over five years ago.

There is no restriction order on his real name: Mark Jenner. Yet his real name – and the real names of other confirmed officers -are not listed on this table, making it hard for the public to keep track of who’s who. It feels as if they’re always trying to keep as much hidden as possible.

His employer, the Metropolitan Police, has still not confirmed his identity or given me any information as to why I was spied on. Despite appealing my Data Protection Act request, I’ve been told repeatedly that the (then) Commissioner had nothing he was obliged to share with me. I cited Jenner in the case we brought against the Metropolitan Police in 2011. In 2013, his photograph, cover and real names were in the press, and I gave testimony to the Home Affairs Select Committee about my five year relationship with him. The Inquiry began in 2015 and I have been given no explanation as to why it has taken three years since then to confirm the truth.

I and other women similarly deceived have received no disclosure about how these abusive relationships were allowed to happen. None of those responsible has been held to account, and the direction the Inquiry has taken towards greater secrecy since the appointment of Sir John Mitting does not bode well for this being remedied.

With other women who have had relationships with undercover officers, I have written this week to the Home Secretary calling for an urgent meeting to discuss our concerns. Our experience is the result of institutional sexism within the police and recent comments by the presiding judge appear to lack any understanding as to what this means.

The Inquiry needs a panel of advisers who have sufficient expertise and diversity to be able to recognise and challenge sexism, racism and police malpractice. As a priority, it should release the cover names of all officers and the files they compiled on activists and campaigners. It should release the names of all groups about whom information was gathered.

If those who have abused their power are to be held to account and the scale of political spying in this country is to be exposed, the Home Secretary needs to act. It is in the public interest for this Inquiry to have the confidence of its core participants. Without transparency, how can the extent of the wrong-doing be understood? How can lessons be learned? And most importantly, how can human rights abuses perpetrated by covert police units be prevented in the future?’


Blacklist Support Group







Leave a Reply