The group Palestine Action was banned in the UK after activists broke into a British air force base in June to protest British military support for Israel’s war with Hamas.

The U.K. government has proscribed the network as a terrorist group, a decision fiercely contested by the group itself.

Amnesty International UK has urged the Metropolitan Police against mass arresting peaceful demonstrators expressing support for the recently banned group, Palestine Action, ahead of a major protest planned in London on Saturday. The protest organized by the activist group, Defend Our Juries, is expected to draw hundreds.