The terms of the Hefer commission of inquiry, which starts on Wednesday, have been amended to include charges that Maduna abused his position and may be guilty of corruption.

This follows Maduna asking President Thabo Mbeki to broaden the commission's terms of reference after he was the subject of two separate allegations of corruption, by mining magnate Brett Kebble and justice deputy director-general Mike Tshishonga.

The Hefer commission was originally set up to investigate whether national public prosecutions director Bulelani Ngcuka spied for the apartheid government and whether that may have compromised his position a charge that emerged during his investigation into corruption allegations against Zuma.

Former transport minister Mac Maharaj and Mo Shaik are expected to make submissions at the inquiry, which was allegedly delayed to accommodate the two men.

Yesterday, Maduna said the charges were linked and part of an orchestrated smear campaign. "We are fighting an adversary we don't know; this is the problem," he said. However, he was hopeful the Hefer inquiry would be effective.

It is not yet clear whether Tshishonga and Kebble will give evidence, although Tshishonga's lawyers made contact on Friday to obtain the new, terms of reference for the inquiry.

Meanwhile, the South African Revenue Service (SARS) has come out in support of Maduna after he was accused by Tshishonga of intervening inappropriately in the winding up of Retail Apparel Group (RAG) to direct that his friend, Enver Motala, be appointed a liquidator.

SARS commissioner Pravin Gordhan said Maduna stepped in after being asked to do so by SARS in terms of section 371 of the Companies Act.

Gordhan said the other creditors, notably banks led by FirstRand and the other four liquidators, disputed SARS' claim against RAG and were "improperly blocking us".

"We viewed this as unfair our approach was correct, we did believe section 371 of the Companies Act allowed Maduna to intervene," Gordhan said. The courts eventually decided to the contrary.

Meanwhile, the ANC said at the weekend there was no evidence that sensitive information had been stolen when thieves gained access to its head office last week, stealing a computer hard drive.

With acknowledgement to the Business Day.