A CIA tip off to South Africa's apartheid regime which led to Nelson Mandela's arrest and 27-year imprisonment was condemned as a betrayal of our nation" by the grandson and heir of the former president. Mandla Mandela called on US President Barack Obama to apologise and make a "full disclosure" of the events leading up to his grandfather's arrest in 1962 ... after a former CIA agent confirmed that he told the apartheid police how to find [Nelson] Mandela. "The USA put its imperial interests above the struggle for liberation of millions of people," said Mr Mandela, the former statesman's eldest grandson who is also an ANC MP. Donald Rickard said he and his handlers believed Mr Mandela was "the world's most dangerous communist outside of the Soviet Union" and he had no qualms about tipping the authorities off about his whereabouts in 1962, the height of the Cold War. The CIA's involvement in his detention after 17 years on the run has long been suspected but has never been confirmed until now. Mr Rickard ... broke his silence about his involvement in netting the "Black Pimpernel" as Mandela was known in an interview in March with researchers for a new film by British director John Irvin. Mr Rickard, who retired from the CIA in 1978 and spent the rest of his life in a remote spot in Colorado, died two weeks after the interview. Zizi Kodwa, a spokesman for the ANC, echoed claims by the ANC's secretary-general that the CIA was still interfering in South African politics.