The acting national president of the Health Services Union (HSU), Chris Brown, believes police should investigate masses of internal documents which raise "disturbing" allegations of financial mismanagement at the union.

Pages of credit card statements have been uploaded to the Independent Australia website and detail a series of questionable payments in two union branches separately led by HSU national secretary Kathy Jackson and her then husband Jeff Jackson.

It shows a HSU Victoria Number 1 branch credit card was used at a Sydney-based brothel, on international travel, pay-TV, clothes and alcohol.

Mr Jackson was the president of the branch at the time of the transactions. The ABC has tried to contact Mr Jackson for comment.

Speaking on the ABC's 7:30 program in May, Ms Jackson said she was not aware of any union official consorting with prostitutes, apart from the allegations against former HSU national secretary Craig Thomson, which he denies.

A Fair Work Australia report into the union's Victoria Number 1 branch last year noted Mr Jackson had agreed to pay back $15,000 he had received through an "unauthorised" salary increase.

The documents also show large amounts of spending from the HSU's Victoria Health Professionals branch - which was led by Ms Jackson - including payments to Neranto Consulting. Company records show she and Mr Jackson were listed as directors at the time.

Mr Brown says he is aware of all the allegations and that they should be independently investigated by Victoria Police.

"On face value, they're quite disturbing," he said.

"Further information is required, so therefore it would require an investigatory body that's got the power to actually get to the bottom of it and get the other documents that are required."

In a statement to the ABC, Ms Jackson said all the allegations against her were "false and malicious" and accused "dark forces" of being behind them.

"They have got all the records from my old branch together and then gone through them with a fine-tooth comb to find any transaction or record that can be misconstrued or presented selectively so as to create an appearance of wrongdoing by me, and then embarked on a full-blown malicious smear campaign," Ms Jackson said.

"There are proper explanations in relation to every matter alleged against me."

Conduct

The documents show that in late 2009 and early 2010, the children of Ms Jackson's partner, Michael Lawler, were employed by her branch of the union.

Mr Lawler is also the vice-president of Fair Work Australia, the body which has been investigating the union's Victorian and national offices.

Through a spokeswoman, Mr Lawler declined to comment in response to a series of questions from the ABC given his position as a "judicial officer", except to say: "His Honour rejects any suggestion of misconduct or inappropriate conduct by himself."

Ms Jackson has defended the decision to hire Mr Lawler's sons, arguing they were needed to help deal with the "variable" workload.

"Matthew and Donald are both extremely intelligent and impressive young men," Ms Jackson said in a statement.

"I considered that the branch was fortunate to have persons of their ability available to take that work.

"In each case, the engagement, and the connection with my partner, was disclosed to the (union's management committee) and the engagement approved," she said.

In May, the ABC revealed Mr Lawler had a direct involvement in the internal politics of the HSU, with documents showing he wrote a letter of complaint to New South Wales police last year on behalf of himself and his partner.

In the letter, Mr Lawler made serious accusations against two HSU officials and included portions of the minutes of union meetings.

In 2010, the HSU Victoria No 1 branch, the Victoria Health Professionals branch and the NSW branch combined to form the powerful HSU East branch.

Last week, the Federal Court placed the HSU East branch into administration and ordered it be split apart and there be fresh elections to appoint a new executive.

Mr Thomson says the documents back up his claims Ms Jackson is not a credible witness to allegations he misused union funds.

"How could Fair Work have all of these documents yet not make any comment on them in relation to the Victorian investigation, yet spend hundreds and hundreds of pages talking about similar issues that I was alleged to do?" he said.