For many years, rogue elements within the State Security Agency (SSA) were acting on instructions of ANC factions.
This is according to the findings of a high-level panel report which was released on Saturday.
The report revealed that an SSA special spy unit conducted illegal operations at the behest of an ANC faction which supported former President Jacob Zuma.
Investigative journalist Pieter-Louis Myburgh says all unlawful activities were to the benefit of the pro-Zuma faction.
He says the SSA also spied on civil society groups and infiltrated ant-Zuma social movements as part of a sophisticated plot to gain intelligence.
According to Myburgh, rogue SSA operatives enriched themselves using "covert funds" that went unaccounted for.
He says spending one particular rogue operation is estimated to be in the region of R1 billion alone.
They literally infiltrated mass protests against Jacob Zuma and planted people within those movements to try an prevent the anti-Zuma sentiment from spreading.— Pieter-Louis Myburgh, Investigative journalist
The SSA became a cash cow for ANC officials.— Pieter-Louis Myburgh, Investigative journalist
Myburgh describes how parallel structures directly served the personal and political interests of the former president and his supporters.
Listen to some of the revelations on The Eusebius McKaiser Show: