A secret inquiry by MI5's watchdog has revealed that the intelligence agency was aware of an abusive agent it defended in court, who exhibited misogynistic tendencies and was 'obsessed' with violence.The investigation followed BBC News' exposure of MI5's cover-up involving agent X, a neo-Nazi informant.

Despite evidence of his violent behavior, including video footage of him threatening his girlfriend with a machete, MI5 did not review his suitability as an agent.

The Investigatory Powers Commissioner's Office (IPCO) criticized MI5 for a 'lack of sufficient professional curiosity' regarding agent X's conduct.The agency misled IPCO about its secrecy policy and provided false evidence in court, leading to further investigations.MI5 has since revised its policies, but the case highlights systemic failures in handling covert human intelligence sources.The victim, known as Beth, expressed frustration over MI5's lack of accountability and requested a full apology.The government has acknowledged the abuse but stopped short of direct condemnation, while MI5 compensated Beth without admitting liability.