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The league's president, Amukelani Ngobeni, said in a statement that Mandela would not have peace should he die without apologising for "selling out black people's struggle through the secret talks with the apartheid government".
Ngobeni said Mandela entered into secret talks and agreed on a compromised constitution which today makes it very difficult, or almost impossible, for government to deliver in its duties to service the citizens.
He said they were following with interest developments around Mandela's health, saying: "Many of his friends did not get an opportunity to apologise before they died, and he must consider himself lucky and use the opportunity for his soul to rest peacefully before it is too late".
He added: "Mandela and his friends were excited and could not wait to occupy the global political space at the expense of the struggle for complete political, social and economic emancipation."
Nelson Mandela Foundation spokesman Sello Hatang said Mandela had always maintained "that he was always acting as part of the collective".
He added it would be best for the ANC to comment on Ngobeni's statement.
However, ANC spokesman Keith Khoza said his organisation would not dignify the statement with a comment.