London's Metropolitan Police arrested dozens of people on July 30, 2026, at a rally outside a court in central London. The people at the rally were showing support for a group called Palestine Action, which the UK government has banned as a terrorist organisation. Al Jazeera

The rally was organised by an activist group called Defend Our Juries. They asked supporters to gather outside Westminster Magistrates' Court on the same day that 25 people were due in court. Those 25 people are accused of showing support for Palestine Action. The exact number of arrests at the rally has not been specified; Al Jazeera described it only as "dozens."

The Metropolitan Police had warned people the night before. At 7 PM on July 29, the force published a notice on its website saying officers would be stationed near the court and that anyone supporting Palestine Action could be arrested. On the day of the rally, the force posted on X: "Expressing support for Palestine Action is an offence under the Terrorism Act. Officers have begun making arrests."

To understand why, it helps to know what "banned" means in this context. When the UK government bans a group under terrorism law, it does not just shut the group down. It also makes it a crime for anyone to publicly support that group, even by carrying a sign with the group's name on it. Under a law called the Terrorism Act 2000, expressing support for a banned group is itself a criminal offence. Palestine Action was placed on the banned list, and since then, people who have publicly supported it have been charged.

This is not a one-off event. The Crown Prosecution Service, which decides whether to bring criminal charges in England and Wales, announced in September 2025 that it would prosecute 24 people for showing support for Palestine Action. By October 2025, the UK government reported that almost 500 people had been arrested under new police powers, with most of those arrests made for supporting the banned group. gov.uk

The numbers have grown since then. Reuters reported that police arrested more than 365 people at a pro-Palestine Action protest on August 9, 2025. On April 11, 2026, London police arrested 523 people at a protest over the ban, according to Reuters. The following day, the French newspaper Le Monde reported that nearly 3,000 people had been arrested since the ban was imposed, mainly for carrying signs defending the group. Reuters

The broader context here is that nearly 3,000 arrests is a very large number, and it raises questions about how far the government should go in policing what people say. Several things about this pattern are worth noting.

First, the people being arrested are not accused of violence, or of giving money or practical help to the banned group. They are being arrested for the act of expressing support, including carrying placards. The law treats the advocacy itself as the harm to be prevented. That is how the Terrorism Act was designed to work, but it puts these cases at the edge of what counter-terrorism law normally covers.

Second, the police are acting before any trouble starts. They published their warning the evening before the July 30 rally, naming the location and saying arrests would follow. This is not a case of police reacting to a protest that turned violent. It is a pre-announced enforcement operation against an act of public expression, organised by a group that set out to challenge the legitimacy of the prosecutions.

Third, the government, the prosecution service, and the police all appear to be working together toward ongoing enforcement, not a single warning shot. The announcements and arrests spread across 2025 and 2026 suggest a deliberate policy of comprehensive enforcement.

The wider question is where the line falls between national security and free speech. The UK is bound by the European Convention on Human Rights, which protects freedom of expression. But that right is not absolute. It can be limited for reasons like national security, as long as the restriction is written into law and is proportionate, meaning the government's response is no greater than necessary. The ban on Palestine Action is written into law, and courts have upheld this kind of restriction before. The open question is whether arresting thousands of people for carrying placards or voicing support crosses the line — and whether courts will see the fact that these are words and signs, not actions, as something that matters when deciding punishment.

For now, the arrests are continuing. The July 30 rally was met with the same legal approach that led to 523 arrests in April and 365 in August 2025. Each court hearing brings new defendants, new demonstrations, and, in turn, new arrests under the same law.