Shabana Mahmood's rise came through Labour's internal machinery before it came through public office.

Keir Starmer brought her back into the shadow cabinet in 2021 as Labour's national campaign coordinator. The appointment followed a bruising period for the party and placed her inside the operation rebuilding Labour's election machine. She became one of Starmer's trusted organisers, then moved to the justice brief before the 2024 election.

Her own election that year was far less comfortable than Labour's national victory.

Mahmood had previously held Birmingham Ladywood with a majority of more than 28,000. In 2024, she won by 3,421 votes after a fierce challenge from independent candidate Akhmed Yakoob, whose campaign focused heavily on Gaza. Mahmood said the election campaign had involved harassment and intimidation directed at her, her family and Labour campaigners.

The result did not stop her promotion. It did show that seniority at Westminster no longer guaranteed safety in her own seat.

Mahmood became justice secretary as the prison system was running out of room. Within days, she announced that some prisoners would be released after serving 40 per cent of their sentence rather than half. The government said the alternative was a breakdown in which courts and police could no longer send convicted offenders to prison. Thousands had already been released under emergency measures introduced before Labour took office.

The decision created space quickly. It did not solve the prison crisis.

Mahmood deserves credit for refusing to pretend that thousands of new cells could appear overnight. She commissioned David Gauke's sentencing review and accepted the broad case for shorter custody in some cases, tougher supervision after release and greater use of community sentences.

Her later reforms went further. The proposed earned-progression system would allow some prisoners to leave after serving a third of their sentence if they behaved well, while those who broke prison rules could stay longer. The aim was to end automatic release and use prison behaviour to determine how much time was served.

The policy carried an obvious weakness. Good behaviour inside prison is not the same as low risk outside it.

Police leaders warned that the changes could push more work onto forces and probation services without enough staff or funding. Victims and domestic-abuse organisations questioned why some violent and sexual offenders remained eligible. The government said detailed assessments and supervision would protect the public, but several of the safeguards were still being argued over after the law had passed.

In July 2026, Andy Burnham paused the next stage of the scheme after the family of PC Andrew Harper learned that two men convicted over his killing might benefit. The policy had been designed and legislated while Mahmood ran the department.

Open Govt note: the July 2026 material, including Andy Burnham's pause of the release scheme and references to his government, is drawn from Open Govt's own record of that period, not external reporting.

That is part of her record.

Mahmood was willing to take an unpopular decision to prevent prisons collapsing. She was less successful at proving that the scheme had been designed around the hardest cases before bereaved families forced them into public view.

Her confrontation with the Sentencing Council showed a different side of her politics.

The council proposed guidance saying courts would normally consider pre-sentence reports for several groups, including ethnic, cultural and faith minorities. Mahmood said this risked different treatment before the law and demanded that the guidance be withdrawn. When the Sentencing Council resisted, Mahmood legislated to give the justice secretary approval over future guidelines.

Supporters saw a minister defending equal treatment and democratic control. Critics saw political pressure placed on an independent body because ministers disliked a guideline produced from evidence about unequal outcomes in the justice system.

Mahmood won the immediate fight. The guidance was delayed and the council's independence was reduced.

The unresolved question is whether that corrected a genuine constitutional imbalance or created a route for future ministers to shape sentencing guidance around political pressure.

Mahmood moved to the Home Office in September 2025 and remained there under Burnham. Her style has stayed consistent. She presents herself as institutionally serious but is prepared to centralise authority when she believes an independent body or failing system is not responding quickly enough.

That can produce decisions. It can also move accountability towards the minister without making the underlying system any more capable.

Her justice record contains both halves. She confronted a prison emergency that others had allowed to grow. She created immediate capacity and pushed through a serious attempt to change sentencing.

The prisons remained full. Probation remained stretched. Victims were still finding out late that offenders in their cases might be released earlier than expected.

Mahmood did not create that crisis.

She did design the answer that is now being rewritten.