The Communication Workers' Union (CWU) is calling for the suspension of all South African Post Office managers and board members in response to the temporary removal of the Post Office's chief executive Khutso Mampeule.
"I believe my suspension is an attempt to divert attention from my concerted effort to uproot corrupt actions," explained Mampeule last week.
This claim was made after he was suspended with full pay at a meeting of the Post Office's board. Mampuele's axing depends on the outcome of a disciplinary case against him.
Expressing shock at his suspension, the CWU said yesterday that it would challenge the decision if this was an attempt to divert attention from, or tamper with, corruption investigations into post office staff and contracts.
Last month Mampeule told parliament that seven post office executives had resigned or were axed in the past 18 months as a direct result of his anti-corruption drive.
In addition, he said 13 suspicious contracts had been cancelled after they were discovered during an audit of all the contracts.
Mampeule said his fight against corruption had "affected some powerful and well-connected people" on the board.
However, board chairwoman Phiti Tskudu said on Friday that this was not the case and that the board had lost confidence in Mampeule.
"He appears to undermine the board's authority and his impartiality has been called into question with regard to the management of the planned forensic audit the board has commissioned to investigate allegations around improper tender practices," she said.
His predecessor, Maanda Manyatshe, resigned last week as managing director of MTN after Mampeule laid criminal charges against him for tender fraud. Manyatshe has said that he would sue the post office for R100million following the allegations.
The CWU believes Mampeule was right to probe contracts signed under Manyatshe, said spokesman Mfanafuthi Sithebe.
The CWU has also called for "the correct intervention" by the Communications Ministry after the parliamentary portfolio committee on communications questioned Minister Ivy Matsepe- Casaburri's handling of the matter. - With Sapa