The decision by the Britain-based Public Relations and Communications Associations (PRCA) comes after Bell Pottinger ran a campaign which included the phrase "white monopoly capital".
![A depression created on the road connecting the cities of Meizhou and Dapu became the site of the tragic event [AFP]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'100'%20height%3D'100'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "A depression created on the road connecting the cities of Meizhou and Dapu became the site of the tragic event [AFP]")
It was carried out on behalf of Oakbay Capital, an investment holding company run by the controversial Gupta family -- itself accused of wielding undue political influence over the South African government.
A PRCA committee set up to investigate the matter said the British firm's campaign "was by any reasonable standard of judgement likely to inflame racial discord in South Africa and appears to have done exactly that".
Announcing the decision to expel Bell Pottinger from the PRCA, director general Francis Ingham said the PR firm had brought the industry "into disrepute with its actions".
"The PRCA has never before passed down such a damning indictment of an agency's behaviour."
The decision has no financial costs for Bell Pottinger, which will be able to operate as normal going forward.
"But they will be doing so with the impact of significant reputational damage," the PRCA's Matt Cartmell told AFP.
"The potential impact on them is large because they've been publicly expelled from the PRCA as a result of their activities," he added.
Bell Pottinger co-founder Tim Bell told the BBC it was "almost certainly" curtains for the firm but said he was not responsible for what had happened.
"I think it probably is getting near the end, you can try and rescue it but it won't be very successful," Bell told the BBC's Newsnight programme.
"I don't take any responsibility. This is 18 months ago... I resigned from the company in August last year, I published my resignation and I said one of the reasons I was leaving was because of the Gupta account," he said.
South Africa's main opposition party, the Democratic Alliance (DA), previously accused Bell Pottinger of having run a "divisive campaign to divide South Africa along the lines of race" on behalf of Oakbay.
The DA criticised Bell Pottinger for promoting "economic apartheid" through its campaign.
On Sunday, Bell Pottinger's chief executive James Henderson resigned from his post.
"Whilst I had no involvement in the account, there were warning signs that I should have heeded. Therefore I must take responsibility," he said.
An independent report conducted by law firm Herbert Smith Freehills released on Monday found senior management at fault for failing to put in place adequate policies to minimise the risks associated with the account.
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![33 passengers and one crew member died on the dive boat, Conception [Brian van der Brug/Los Angeles Times/AP]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'300'%20height%3D'172'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "33 passengers and one crew member died on the dive boat, Conception [Brian van der Brug/Los Angeles Times/AP]")
