The publishers of journalist Jacques Pauw's book about Jacob Zuma have received a cease and desist letter from the State Security Agency.
The letter demands that NB Publishers withdraws the book from stores and retracts parts of the book.
A media statement also indicates the agency is threatening to go to court over the matter.
The President's Keepers claims Zuma received R1 million a month from a security company without declaring it to the revenue service.
It also accuses presidential hopeful Nkosazana Dlamini Zuma of dealings with a notorious businessman.
Pauw says he stands by his work, adding that he didn’t approach the Presidency or Dlamini Zuma for a reply because he felt it was too dangerous.
“This is clearly not a work of journalism, this is not a story in a newspaper. But even the press makes provision for the fact that if the newspapers, for example, believes that publication can be stopped by asking people for comment, it is justifiable not to go to those persons to get their side of the story.”
Dlamini Zuma's spokesperson Carl Niehaus insists they have no ties with Adriano Mazzotti.
“Primarily this campaign is being funded and run through volunteers, people who do not demand payment for their time but we do it out of commitment.”