London's Metropolitan Police arrested at least 48 people on Saturday for attending a rally outside the US embassy opposing the UK government's proscription of Palestine Action. The majority were detained for "expressing support for a proscribed organisation" — a crime carrying up to 14 years in prison under the Terrorism Act 2000. The demonstration, organised by Defend Our Juries, was the first mass protest against the ban since Prime Minister Andy Burnham took office in July. A parallel gathering at the US consulate in Edinburgh produced no arrests. The numbers tell the story of a policy machine running at industrial scale. According to Defend Our Juries, Saturday's arrests brought the total number of people detained under the Palestine Action proscription to more than 4,000 since July 2025. That figure dwarfs enforcement under most other proscription orders and suggests either a genuinely massive protest movement or an enforcement posture calibrated to maximum deterrence rather than proportionate response. Probably both. The legal architecture matters. Palestine Action was added to the same proscription list as al-Qaeda and ISIL under the government of then-Prime Minister Keir Starmer. The designation means that expressing support, wearing insignia, or attending meetings can all constitute criminal offences. Labour MP John McDonnell argued on X that protesting against a proscription decision cannot be "automatically interpreted" as supporting the proscribed organisation — a distinction that will likely feature in Wednesday's Supreme Court appeal. The extraction pattern is straightforward: the proscription framework transfers the costs of political dissent onto individual protesters while shielding the government from accountability for its policy choices. Amnesty International UK's Felix Jakens described the sight of "grandparents, teenagers and everyone in between being hauled into police vans for peacefully holding placards" as a "disgraceful attack on freedom of speech." Defend Our Juries framed the ban as the UK "appeasing Trump and the Israeli weapons companies that Palestine Action disrupted," positioning the proscription as corporate protection dressed in counterterrorism language. The Supreme Court hearing on Wednesday is the critical pressure test. If the court upholds the proscription, the precedent hardens: direct-action protest groups that target corporate supply chains can be designated terrorist organisations, and anyone who publicly objects to that designation risks arrest. If the court strikes it down, the government faces the political cost of having criminalised thousands of people under a law subsequently found to be overreach. The Burnham government has inherited this problem but owns it now. The proscription was Starmer's decision, but every arrest since July is happening under Burnham's watch. The 4,000-arrest figure is becoming a political liability — either as evidence that the policy is working against a genuine threat, or as evidence that the UK has built a protest-suppression machine and pointed it at placards. There is no neutral reading of that number. Wednesday's hearing will determine whether the judicial branch provides a check on what the executive has built. The protesters are betting that the courts will distinguish between terrorism and civil disobedience. The government is betting they won't have to.
