It's become known as the "marikana massacre" – thirty-four people were killed as police in South Africa opened fire on striking miners. For many it had echoes of Sharpeville in 1960 - one of the defining events which opened the world's eyes to the consequences of apartheid. For Frans Baleni, General Secretary of the National Union of Mineworkers, Marikana is a challenge - not just to his union, but to the whole post-apartheid political system in which the NUM has been a key player. Eighteen years after black South Africans won legal equality, is the violence evidence that the system has failed all but a tiny political elite? Shaun Ley talks to Frans Baleni.