The angry crowd, which earlier hurled Cadbury’s Cream Eggs at chief Ukip donor Arron Banks – which he picked up and ate – shouted the vile abuse at Shneur Odze.
The 35-year-old, who is standing against Andy Burnham to become Mayor of Greater Manchester, said he feared the situation outside Paul Nuttall’s rally could have become “very dangerous”.
Many in the crowd were holding Labour Party signs, others belonged to different left wing organisations.
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Shneur Odze is the Ukip candidate for the Mayor of Greater Manchester
These are supposedly liberal people, who are supposedly tolerant, but that was racist
Mr Odze told Express.co.uk: “They were shouting all kinds of abuse – the whole crowd.
“I asked them what bit of democracy they didn’t like and then a woman holding a sign reading ‘strength in diversity’ told me to ‘go home’.
“They didn’t shout it to the two white people stood next to me. Just me.
“I asked them where they wanted me to go home to – where I was born in Manchester, where I live in Hackney, maybe Morocco where my mother was from or Poland, where my grandfather was born.”
Shneur Odze is an Ultra Orthodox Jewish man
He added: “I’m afraid of what this country has become. These are supposedly liberal people, who are supposedly tolerant, but that was racist.”
Mr Odze believes the crowd behaved in such a prejudicial, racially insensitive way because they were angry that Ukip and the Leave camp won the EU referendum.
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He said: “They are so embittered because we are winning. But these left wingers barely speak for themselves, let alone the country.”
Nigel Farage in Stoke ahead of the crunch by-election
Ukip MEP James Carver tweeted about the incident
A Ukip spokesman said: “Today’s Labour don’t seem to be able to help themselves.
“The anti-semitic attack against our candidate for Mayor in Manchester, Mr Odze, is just the latest in a series of examples of Labour extremism.
“It is sad, but merely highlights a deep problem for Mr Corbyn. Labour must root it out and fast.”
Express.co.uk has contacted the Labour Party for comment and is awaiting reply.