LONDON (AP) — Police in London have arrested at least 150 people for intentionally violating a new law banning support for a pro-Palestinian group.

Backers of Palestine Action have staged a series of protests across the U.K. since early July, when Parliament outlawed the group and prohibited anyone from publicly showing support for it. Lawmakers banned the group as a terrorist organization after activists broke into a Royal Air Force base and vandalized two tanker aircraft.

Protesters, who say the legislation improperly restricts freedom of expression, gathered Saturday afternoon in the square outside Parliament, with dozens displaying signs reading “I oppose genocide. I support Palestine Action.” That was enough for police to step in.

“While many of those remaining in the Square are me

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