London Tests the Price of Proscription

At least 48 people were arrested in London after hundreds gathered outside the US embassy to protest the United Kingdom’s proscription of Palestine Action, according to Al Jazeera, citing the Metropolitan Police. The force said the majority of the arrests were for expressing support for a proscribed organisation.

That distinction is the legal hinge, and it is not a small one. The event was a protest against a government decision. The arrests, on the police account, were not framed as punishment for objecting to that decision, but for conduct the force says crossed into support for a group the UK has formally placed on its terrorism list. In ordinary language: British law does not treat “I oppose this ban” and “I support the banned group” as the same sentence, even if they appear on the same placard and in the same crowd. Sorting one from the other is now doing a lot of work.

Palestine Action was proscribed under UK law in July 2025, according to Al Jazeera. That puts it in a legal category with consequences far beyond bad press. Once a group is proscribed, support-related speech and symbols can become criminal matters, depending on what was said or displayed and how prosecutors characterise it. Institutions enjoy these moments of solemn taxonomy. The practical effect is simpler: the state acquires a much sharper tool.

The protest came before a Supreme Court appeal challenging the proscription. That matters because the legal question is not whether Palestine Action is controversial. It is whether the government lawfully used terrorism powers to ban it. Those are different arguments, however much politics tries to make them roommates.

Labour MP John McDonnell argued on X that protesting the proscription cannot be “automatically interpreted” as support for the organisation and therefore as an arrestable offence, according to Al Jazeera. Amnesty International UK, also cited by Al Jazeera, called the arrests an attack on freedom of expression and urged the government to reverse the ban.

The organisers, Defend Our Juries, said the latest arrests brought the number of people detained for defying the ban to more than 4,000 since July 2025, a figure reported by Al Jazeera via the Press Association. That number is politically useful to both sides. For campaigners, it suggests overreach on an industrial scale. For the state, it may read as proof that proscription has become an enforcement regime, not just a line in the statute book.

There was also a protest outside the US consulate in Edinburgh, where Al Jazeera reported no arrests.

What was actually decided here, for the moment, is narrow. Police exercised arrest powers at a demonstration involving a banned organisation. No court, on the facts available, has ruled on the lawfulness of these particular arrests, and no Supreme Court appeal has yet undone the underlying proscription. The government’s authority remains intact unless and until the court says otherwise.

The uncomfortable clause in all this is that proscription does not only target organisation and funding; it changes the risk of language itself. Once the label is in place, a placard can become an evidentiary exhibit. Governments call that public protection. Critics call it a shortcut around dissent. The appeal will not settle the politics, but it may decide whether ministers used the right legal weapon for the job.