Mlangeni spent 27 years in prison alongside Nelson Mandela, Dennis Goldberg, Walter Sisulu and other activists who were sentenced for planning to overthrow the apartheid government.
South African President Cyril Ramaphosa leads ruling African National Congress to victory but a drop in its share of the vote underlines the challenge he faces restoring confidence in his party.
The governing African National Congress is ahead as ballot count continues in an election that has seen a low turnout.
The vote is seen as the toughest test yet for the governing African National Congress (ANC) party, 25 years after it swept to power at the end of white minority rule.
The African National Congress, the party of Nelson Mandela, which has been in power since 1994, is likely to win a majority but will face a difficult challenge to match the 62 percent of the vote that it won in the previous election five years ago.
Three opinion polls in recent weeks show the ANC's support ranging between 51 and 61 percent, compared with the 62 percent it won in 2014.
South Africa's main opposition party says it could go to court to stop proposed land reforms after the country's National Assembly endorsed a report calling for the constitution to be changed, paving the way for expropriations without compensation.
President Rodrigo Duterte’s desire to create a death squad drew criticism from the country's left, saying his plans could trigger a situation similar to the anti-drugs campaign killings.
The power struggle over Jacob Zuma's departure put the president at loggerheads with Cyril Ramaphosa, his expected successor, who is the head of the ruling African National Congress party.
Jacob Zuma, in power since 2009 and beset by corruption allegations, has been in a weakened position since Deputy President Cyril Ramaphosa replaced him as ANC leader in December.
Condemnations across all divides pour in after US President Donald Trump's vulgar language against immigrants from Haiti and what he said are "s***hole countries" in Africa.
The victory puts Ramaphosa in line to succeed President Jacob Zuma, whose reign has been plagued by corruption scandals and economic slowdown.
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