In 2016, Labor’s “Mediscare” campaign falsely suggested the Coalition wanted to privatise Medicare. Three years later, the tables had turned and various groups incorrectly claimed Labor wanted to implement a “death tax”, also known as an inheritance tax, fanned by similar messages from the government.

The link to the United Workers Union – a major Labor donor that represents generally low-paid workers in sectors such as warehousing, cleaning, aged care, and casinos – is only apparent through Google’s political ad database.

The campaign website it links to bears no union branding and is only authorised by a “G Moran” of a residential address in Brisbane, whom the Herald and The Age were unable to contact.

“Pensioners won’t even be able to buy Christmas gifts for their grandchildren under the new Liberal-National plan,” the site reads.

While the cashless debit card restricts the use of cash, it has no prohibition on buying children’s toys or other likely presents – except gift cards that could be used to buy alcohol.

Social Services Minister Anne Ruston said the ads were a shameful attempt to scare senior Australians into voting for Labor. “This is another example of the union movement doing the Labor Party’s dirty work,” Senator Ruston said.

She said it “beggars belief” that the union was circulating claim the government did not want grandparents to be able to buy their grandchildren Christmas presents.

“It is up there [with the] most ridiculous, disgusting and dishonest claims I have ever heard in my time in politics,” she said.

On the government’s policy, Senator Ruston was emphatic. “The Morrison government couldn’t be clearer – we have never and will never have a plan to force age pensioners on to the Cashless Debit Card. We have made this guarantee in legislation.”

Labor has no apparent involvement in the ads or website, but several of its MPs all the way up to deputy leader Richard Marles have previously claimed that the government plans to quarantine pensioners’ income on cashless debit cards.

A spokeswoman for the union said the ads are consistent with the requirements of electoral legislation and it would fight back against attacks that undermine the secure retirement of working people.

“We make no apologies for taking a stand against legislation introduced by the Morrison government that has the potential to unfairly punish vulnerable members of our community,” the spokeswoman said.

The union did not answer questions about whether it was responsible for the landing site as well as the ads pointing to it or why its involvement is largely hidden.

Experts have previously warned that false claims are politically powerful because attempts to rebut them can draw further attention and reinforce their general ethos in voters’ minds.

Figures from the Department of Social Services show there are 24 age pensioners on the cashless debit card, primarily people who have opted in around the Cape York area, with none forced onto it by the federal government.

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In contrast to other political expenditure, which includes tens of thousands of dollars in donations to the ALP, the United Workers Union has spent only a small amount on its cashless debit card ads.

On one ad, which ran for 16 days last year, the union spent between $150 and $1500, according to Google, which only provides ranges rather than exact figures. Another ran for 10 days for the same amount. But the audience is large. One was seen between 10,000 and 100,000 times, the other between 100,000 and 1 million times.

That is well below the reach of the United Australia Party, backed by Clive Palmer, which has spent more than $6 million in ads on Google’s platforms alone since November 2020.