Pro-Palestine marchers joining in with chants deemed incendiary face arrest as part of a new Met Police crackdown.
The move follows Sunday’s terror attack on Bondi Beach, Sydney, where Jews were deliberately targeted while enjoying Hanukkah celebrations.
The Met said the mass shooting, along with events like the Heaton Park Synagogue attack in Manchester has spurred them into action.
As a result, placards and chants such as “globalise the intifada” should expect the Met and Greater Manchester Police to take action, they said in a statement.
“Violent acts have taken place, the context has changed – words have meaning and consequence”, they said.
“We will act decisively and make arrests.”
They added: “Frontline officers will be briefed on this enhanced approach. We will also use powers under the Public Order Act, including conditions around London synagogues during public services.”
Surviving suspect of the attack is 24-year-old Naveed Akram, who has been charged with 15 counts of murder and committing a terrorist attack following the incident in Sydney, Australia, on Sunday.
Akram and his father Sajid, 50, are accused of opening fire on crowds of more than 1,000 people celebrating Hanukkah in the Archer Park area of Bondi Beach on Sunday evening.
Following the attack in Sydney, Sajid Akram was shot dead by police at the scene, and two officers were also non-fatally shot as gunfire was exchanged.
Naveed Akram remains under armed guard in hospital.
Along with the murders, he is accused of 40 counts of causing wounding/grievous bodily harm, a public display of a prohibited terrorist organisation symbol, and placing an explosive in/near a building with the intent to cause harm.
In a joint statement, Met Police Chief Commissioner Sir Mark Rowley and Greater Manchester Police Chief Constable Sir Stephen Watson said due to the “escalating threat”, both forces will now “recalibrate to be more assertive”.
They said: “We have consistently been advised by the CPS that many of the phrases causing fear in Jewish communities don’t meet prosecution thresholds.
“Now, in the escalating threat context, we will recalibrate to be more assertive.”
Sir Mark Rowley has previously claimed the law gets in the way of police officers stopping antisemitic protests.
Pro-Palestine protesters in London | GETTY
Sir Mark said he was “concerned” that protesters could “stir up racial hatred” in the UK without being sanctioned accordingly.
He says new laws he advocated four years ago to hone in on “hateful extremism” could allow officers to tackle behaviour that falls short of counter-terror legislation.
The Met Commissioner spoke to The Telegraph on Friday, before the Bondi Beach terror attack, where he spoke about perceived gaps in Britain’s laws.