Work and Pensions Secretary Pat McFadden was jeered and booed as he spoke at a rally against antisemitism in London on Sunday.
Thousands of people gathered outside Downing Street to protest against antisemitism and call on the Government to do more to protect British Jews.
Protesters were waving Israeli flags, the Union flag, Iranian protest flags and holding protest placards.
Some signs say “British Jews deserve better”, “where is Keir” and “Brits against antisemitism”.
On stage at the rally, Mr McFadden said: “I come to speak for something, for freedom, for the freedom that marks us out as a great country.”
Protesters shouted “shame”, “it’s your party’s fault”, “when will you act” and “Jew harmer” at the Labour politician.
As his voice was drowned out by the boos, Mr McFadden said: “Friends, I hear you, I am with you, I am here to fight antisemitism.”
Politicians from across the spectrum spoke at the rally, with Kemi Badenoch, leader of the Conservative Party, receiving huge applause as she took the stage.
She said: “Many of you know that I was born in this country, but I grew up in Nigeria, and in 2014, I remember when 300 schoolgirls were stolen from their school by Islamic extremists, and only a few returned.
“I remember on October 7, I saw that same terror, the murder and the massacre of young people at a music festival.
“There are many, many different pockets of antisemitism in this country, but I am most worried about the growth of extremism and terror around the world and how it targets many groups in this country.
“Britain has been a sanctuary for Jewish people, and it must always be a sanctuary for Jewish people.”
Mrs Badenoch, alongside other politicians, called for the Iranian Revolutionary Guard Corps (IRGC) to be banned as a terrorist organisation.
Richard Tice, deputy leader of Reform UK, said: “What we need is action.
“We need to ban and proscribe the IRGC, we are sick of them. Get them out of our country.”
Mr Tice added: “The scourge of antisemitism has been allowed to flourish in our beloved country, and we have to say we are sick and tired of warm words from waffly politicians.
“We need to take on the failure of leadership in our universities. Maybe we should say to the universities, if you allow this to carry on, forget any form of grants. Forget any form of student loans. Forget any form of research funding.”
The latest rally comes after two Jewish men were stabbed in Golders Green on April 29.
Boy George, who previously said he had been left “in tears” following the stabbings, sent a video message of support for the attendees on Sunday.
In the aftermath of the Golders Green assaults, he said he had received abuse online over his messages of solidarity with the Jewish community.
In a pre-recorded message, the singer said he wished he had been able to attend the event, saying “Not only for those amazing Jewish people, but also people who support their Jewish friends”.
He added: “People like me keep being thanked for speaking up for Jewish people. I don’t want to be thanked for doing what is right.
“I have so many Jewish friends and know some would be there today, but even if I don’t know you, I send you my love, and I hope today we send a powerful message to the entire world.
“God bless you all and have the most amazing event.”
Simi, 27, lives close to where the stabbings took place and attended the event with her friends to show that hatred is not welcome in the UK.
She said: “Whatever hate that we have, love is so much greater and love will always win. You felt that today, it was so much fun, there was a lot of singing and I was screaming my lungs out.
“It was great to see and feel real unity, particularly between Iranians and Jews, and it is just so beautiful to see them supporting us.
“It is beautiful to see Christians and non-Jews supporting us too, it really is moving.”
Another protester, who is Jewish and wished to remain anonymous, said she was disappointed with the government and policing.
She said: “I don’t live in a predominantly Jewish area, so I don’t get the same protections as others do.
“There are signs outside my home calling for Zionists to be killed.
“Unfortunately, the police have to focus their efforts in Jewish areas, but if I want to walk around proudly Jewish in my area, I don’t feel safe.
“The CPS should tie anti-Zionism and antisemitism together to better protect British Jews.”
The event, organised by the Jewish Leadership Council and the Board of Deputies of British Jews, was attended by “over 20,000”, according to speakers at the rally.
Strict security measures were in place with attendees going through airport style security, with metal detectors and bag searches, at the Trafalgar Square entrance to Whitehall.
A Metropolitan Police spokesperson said three arrests were made as part of a “proactive policing plan”.
A man in his 30s was arrested in Whitehall on suspicion of being in possession of a bladed article in a public place, after search arches identified he was carrying a Stanley knife.
Two men in their 60s were arrested by officers on patrol in Storey’s Gate on suspicion of possession of an offensive weapon, namely batons.
A police statement said: “They have all been taken into custody and inquiries continue around the circumstances of each incident.”
The force announced this week a community protection team of 100 extra officers to help to safeguard the Jewish community, despite Sir Mark Rowley’s previous call for 300 extra police officers.
The Metropolitan Police Commissioner warned of a growing “pandemic” of antisemitism in the UK and said he is “very concerned” about the sustainability of the force’s current approach to protecting Jewish communities in the capital.