Palestine Action has won its application for a judicial review after MPs voted to ban it as a terrorist group.
The High Court ruled that several of the grounds that Palestine Action presented to the court as to why the government’s actions were unreasonable were upheld on Wednesday.
Palestine Action’s co-founder Huda Ammori made a bid to challenge Home Secretary Yvette Cooper’s decision to proscribe the group under anti-terror laws.
On Wednesday, judge Mr Justice Chamberlain said he had decided that two parts of the arguments on Ms Ammori’s behalf were “reasonably arguable”.
He said one of the arguments that will go on to a full legal challenge was regarding whether the home secretary should have consulted Palestine Action before banning the group.
Another was due to its impact on freedom of expression and freedom of assembly.
Palestine Action was proscribed under the Terrorism Act 2000 at the start of the month, after MPs overwhelmingly voted in favour of adding the protest group to the list of banned organisations with the likes of National Action, al Qaeda, ISIS and Hezbollah.
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The decision made membership of, or support for, the direct action group a criminal offence punishable by up to 14 years in prison.
Even wearing a T-shirt or badge with the group’s name on attracts a maximum six-month sentence.
The home secretary announced plans to proscribe the group after two Voyager aircraft were allegedly damaged at RAF Brize Norton in Oxfordshire on 20 June, which police said caused around £7m worth of damage.
Since the order came into effect on 5 July, more than 100 people have been arrested for demonstrating in support of the group.
Lawyers for Ms Ammori previously told the High Court the decision was “so extreme as to render the UK an international outlier”.
Raza Husain KC said: “We say the proscription of Palestine Action is repugnant to the tradition of the common law and contrary to the ECHR [European Convention on Human Rights].”
The UN’s high commissioner for human rights Volker Turk previously also called the proscription order a “disturbing misuse” of counter-terror laws, calling the government’s order “disproportionate and unnecessary”.
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The Home Office is defending the decision.
Sir James Eadie KC, for the department, said in written submissions that by causing serious damage to property, Palestine Action was “squarely” within part of the terrorism laws used in proscription.
He said: “There is no credible basis on which it can be asserted that the purpose of this activity is not designed to influence the government, or to intimidate the public or a section of the public, and for the purpose of advancing a political, religious, racial or ideological cause.”