The Sharpeville massacre of 21 March 1960 - the 50th anniversary of which was commemorated in the past week - brought notoriety to the National Party government of premier Hendrik Verwoerd and elevated the Pan Africanist Congress (PAC) to the status of a major anti-apartheid resistance movement overnight.
But if the PAC's civil disobedience against the hated pass laws had not led to violence in Sharpeville - it had not done so in Soweto and elsewhere - it's campaign might simply have become another failed attempt by blacks to persuade the government to abolish oppressive and discriminatory legislation, as Thomas Karis and Gwendolen Carter argue in their documentary history of black protest and resistance in South Africa.
It should be emphasised that the PAC campaign was conceived as one modelled on the passive resistance strategy pioneered by Mahatma Gandhi in South Africa and later used to dislodge British rule in India. It should similarly be noted that PAC leader Robert Sobukwe wrote to the authorities informing them of the campaign and stressing that it would be non-violent.
With the advantage of hindsight two underlying factors that led to the police opening fire on the black civilians who had surrounded the police station at Sharpeville and to the killing of 69 black people - most of whom had been shot in the back while fleeing - and the wounding of another 180.
The first factor was the killing of nine policemen in Cata Manor, near Durban, by an enraged crowd of people living there a few weeks before.
Cato Manor had long been a place of turbulence and anger because of repeated attempts by the authorities to prevent black people from establishing shanty settlements there.