Police have arrested 66 protesters on suspicion of supporting Palestine Action at a rally outside the Labour party conference.
An 83-year-old among those detained by Merseyside police outside the venue in Liverpool.
Dozens of protesters gathered outside the conference centre on Sunday, many holding signs that read: “I oppose genocide. I support Palestine Action.”
Merseyside police said on Monday that 66 people were arrested. Two were later de-arrested, while 64 were held on suspicion of supporting a proscribed terror organisation and later bailed.
They were all aged between 21 and 83.
Palestine Action supporters had said they were willing to risk arrest by picketing the first day of the Labour Party Conference in protest at the group being proscribed a terror organisation.
At least 100 supporters descended on the political conference in Liverpool as Campaign group Defend Our Juries said protesters would be “confronting MPs, cabinet members, as well as delegates” as they walk into the event.
A spokesperson for Defend Our Juries said: “Despite deploying hundreds of officers, Merseyside Police were unable to fully enforce the Government’s ban on Palestine Action — even on its own doorstep.
“After nearly six hours, only about half of the peaceful protesters sitting with cardboard signs saying 'I oppose genocide. I support Palestine Action' were arrested.
“It’s never been clearer that this ban is unenforceable, unworkable, and collapsing under the weight of its own absurdity.”
Protests continued at the conference on Monday, with one demonstrator interupting Chancellor Rachel Reeves during her keynote speech and dozens more gathered outside.
Shabana Mahmood is due to give her first conference speech as Home Secretary on Monday.
Palestine Action was banned by her predecessor Yvette Cooper under the Terrorism Act in July after supporters caused an estimated £7million of damage to jets at RAF Brize Norton.
More than 1,500 people are believed to have been arrested since Palestine Action was proscribed a terror organisation.
Many have been elderly and priests, vicars, retired healthcare workers and teachers are among those who have been detained.
Supporting a terror group carries a sentence of up to 14 years in prison.
The demonstration at Labour Conference comes ahead of a planned national mobilisation in Parliament Square on October 4.
Almost 900 people were arrested during a mass “Lift the Ban” Palestine Action protest in Westminster earlier this month organised in support of the group.
Despite the arrests Defend Our Juries said more than 1,100 people have already registered to participate in the next mass sign-holding and are willing to be arrested. At least 1,500 people have signed up to attend, it has been reported.
The Met has previously confirmed that all individuals arrested under the Terrorism Act will now be investigated by its Counter Terrorism Command.
The force said it has been working with the Crown Prosecution Service in recent weeks to speed up charging decisions in such cases.
