Undercover cop has sex with activist target.

The fourth, of late, apparently.  This one also married and had kids with the activist he was spying on.

The Spy Who Married Me - Boing Boing:

"An undercover cop assigned to infiltrate and surveil environmental activist groups in the UK married one of the activists he was sent to spy on."

Minus the scandalousness, a bigger point that's rarely noted is that the modus operandi for these ops is that the cops go undercover, become a "key organiser" and steer the org into criminal activity. Then bust them for it. Not dissimilar to several of the terrorism stings in the States.

Undercover policeman married activist he was sent to spy on | UK news | The Guardian:

"...He is the fourth spy now to have been identified as an undercover police officer engaged in the covert surveillance of eco-activists. Three of those spies are accused of having had sexual relationships with the people they were targeting.

...Jon Murphy, the chief constable of Merseyside, told the Guardian it was "never acceptable" for undercover officers to sleep with people they were targeting.

"Something has gone badly wrong here. We would not be where we are if it had not," he said, referring to three inquiries into undercover policing that have been launched in response to the Guardian's investigation into the first spy, Mark Kennedy, an undercover officer who had several sexual relationships during his seven-year deployment.

Murphy, who is the national lead officer on serious and organised crime for the Association of Chief Police Officers, declined to speak about the Kennedy case directly but said officers who infiltrated the environmental movement were not permitted "under any circumstances" to sleep with activists.

"It is grossly unprofessional. It is a diversion from what they are there to do. It is morally wrong because people have been put there to do a particular task and people have got trust in them," he said.

...During his time undercover, when he is said to have become a key organiser, Boyling met a 28-year-old woman and began a relationship with her. He later disappeared from her life..."