The 532 arrests mark the highest number by the Metropolitan Police at a single protest since the 1990s, with many of those held reported to be over 60.
Politicians from across the spectrum, including David Davis and Peter Hain, alongside civil liberties groups like Amnesty and Liberty, have condemned the arrests as an excessive use of counter-terrorism powers.
Labour peer Shami Chakrabarti said the Palestine Action proscription “is in danger of becoming a mistake of poll tax proportions” – a reference to Margaret Thatcher’s unpopular policy that sparked riots.
The government defended the proscription, citing alleged criminal damage and targeting of Jewish-owned businesses by the group.