Britain’s counter-extremism czar has warned that London is “a no-go zone for Jews every weekend” amid pro-Palestinian protests.

Robin Simcox said a “permissive environment for radicalization” was developing and welcomed the government’s expected move to create a new definition of extremism.

But he also urged the government to be “faster, bolder and willing to accept higher legal risks” if it meant introducing policies to keep the public safe.

Writing in the Daily Telegraph, the Counter-Extremism Commissioner said that “extremist networks have never been bolder” since the September 11 attacks.

“We would not become a dictatorship if London was no longer allowed to become a no-go zone for Jews every weekend,” he said.

His comments came after Chancellor Rishi Sunak. Condemns “extremist forces trying to divide us”.

Michael Gove is expected to set out a new definition of extremism in the coming days, which could include banning government officials from contacting or funding groups or individuals deemed extremist.

But it has raised concerns among some on the right, who worry it could inadvertently punish groups opposed to same-sex marriage, abortion or new transgender rights.

Mr Simcox said: “While actual extremist behavior is so widespread that debates over definitions feel like academic idiocy, this work does have a clear purpose: it will be used to guide future decisions about government Decisions about what to do and what not to do. Get involved and fund it.”

He said the government had a “right to act” and argued that evidence of the government “collaborating with or funding extremists” emerged in an independent review a decade ago.

“Does this require a revised new definition of extremism,” he said.

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He said the government and its agencies already had powers to combat extremism but had failed to target groups that fell below the terrorist threshold.

He said Whitehall had “greater powers to combat extremism than it sometimes imagines”.

“After all, the Iranian government does not have the inalienable right to open schools and mosques in our capital,” he said.

“It is not an immutable democratic principle that Hamas and the Muslim Brotherhood must be allowed to run numerous charities,” he said.

“We have not betrayed democracy if extremists can no longer run television channels.”