A building opposite Labour’s central London headquarters have been covered with a huge poster depicting a scene of devastation in Gaza.
The demonstration by campaign group Led by Donkeys shows an image of bombed-out buildings next to the caption “protesting this isn’t terrorism”.
It comes following the Government’s decision to proscribe Palestine Action as a terrorist group, with over 100 people arrested across the UK over the last fortnight.
Expressing support for Palestine Action can carry a prison sentence of 14 years following the Home Secretary’s decision.
A spokesperson for Led by Donkeys said: “A genocide is underway, but the Labour government is supplying weapons, intelligence and diplomatic cover to the perpetrator.
“They are also continuing the Conservatives’ policy of radically restricting the right to peacefully protest on issues like Palestine and climate change.

“Two of the founders of Led By Donkeys were prosecuted in 2008 for a direct action protest at Kingsnorth power station.
“Their first barrister in the case, who developed a legal defence for them, was Keir Starmer. The defendants were acquitted by a jury.
“Now Starmer is responsible for measures that severely limit the scope for peaceful protest in the UK on a range of important issues.”
Documents have today revealed hundreds of people are planning to get arrested this summer in support of Palestine Action.

At least 500 demonstrators are preparing to sit in London for 60 minutes or “until arrest” on August 9 while holding signs which state: “I oppose Genocide. I support Palestine Action.”
An updated 15-page document titled “Lift the ban, De-proscribe Palestine Action” details the group’s plot to overwhelm police and the justice system until the Government is forced to reverse the ban.
It explains: “(The protest) will be a conditional commitment action, which means it will only go ahead if 500 people have committed to taking action on the same day.
“The intention is for a mass action on a scale that makes it almost impossible for the police to intervene.
“Although there’s a substantial risk of arrest, and all taking part should be prepared for that, the indications from the past three Saturdays are that the stakes for action-takers are relatively low, in comparison to the worst-case scenarios.
“No-one has yet been charged with an offence, and no-one has been remanded.”
Their stunt, which is scheduled for next month in the capital, would be the largest escalation in a series of protests that have taken place across the UK since the ban came into place on July 5.