It is a criminal offence to belong to or support Palestine Action, punishable by up to 14 years in jail. The ban, which came into force last July, was ruled unlawful in February but remains in place pending an appeal.
Following the High Court judgment on the ban, the Met had indicated that it would be unlikely to make arrests over expressing support for the group, but in March said it would resume such arrests.
Protest group Defend Our Juries organised the protest and said the demonstration, called Everyone Day, would show the “resistance” to the ban was “stronger than ever”.
One protester told the BBC she had been arrested 10 times before and expected to be arrested again.
Another protester appeared to be arrested wearing a red headband that said “Palestinian hostage”.
Massive Attack musician Robert Del Naja was arrested after holding a sign that read 'I oppose genocide, I support Palestine Action' (Instagram)[Missing Credit]
Among those arrested on Saturday was Massive Attack musician Robert Del Naja, who sat with an “I Support Palestine Action” sign and was later carried away by three police officers.
Before his arrest, Del Naja, a member of the trip-hop band from Bristol, was filmed saying, “We believe ourselves to be the good people but we’re the people on the side of the missile launchers, not the people the missiles are being fired at.
“We have to use these moments to protest, otherwise this democratic country we live in doesn’t actually stand for anything,” Del Naja said.
The 61-year-old told the Press Association that he had considered the consequences a potential arrest could have on his music career.
"Being a musician, obviously, there was a lot of trepidation around how we might not be able to travel and get visas," he said.
"But I thought 'this is ridiculous' and then the police making that U-turn to arrest people again, I thought that is even more ridiculous.
"If I get arrested, I feel very confident that if I stand up in court with the right guidance and say 'this was an unlawful arrest and, therefore, I don't accept it,’” he went on.
A spokesperson for the Met said: “We are grateful to all the officers involved for their professionalism.”
