Palestine Action was banned by Home Secretary Yvette Cooper following criminal damage to planes at RAF Brize Norton.
As a result, membership of or support for the group is a criminal offence, punishable by up to 14 years in prison.
Cooper said the ban was based on “strong security advice following serious attacks the group has committed” as well as “plans and ideas for further attacks”.
But Amnesty International chief executive Sacha Deshmukh has described the mass arrests that have happened since then as “deeply concerning”.
Last month, the High Court ruled that Palestine Action would be able to challenge its proscription.
Lawyers for the group’s co-founder Huda Ammori argue that the ban breaches the right to free speech and acts as a gag on legitimate protest.