Environmental activists Extinction Rebellion are set to challenge a London-wide protest ban at the High Court.
The Metropolitan Police imposed a blanket ban across the capital last week, making any assembly of more than two people linked to XR's Autumn Uprising action illegal.
The group is challenging what it says is an "unprecedented and disproportionate" ban on protests.
They argue that the order was an "unprecedented and disproportionate curtailment" of the right to free speech and free assembly which risks criminalising protest about the climate and ecological emergency in the capital.
The Met contends the ban, which is no longer in place, was lawful and was the only way of tackling the disruption caused by XR.
In 10 days of protests to call for urgent action on climate change and wildlife losses, XR activists shut down areas around Parliament and the Bank of England, and targeted London City Airport and Government departments.
The force said 1,832 people were arrested during the protests, and more than 150 were charged with offences.
Australian Associated Press
