Factional fighting between supporters of the African National Congress and their rivals, the Inkatha Freedom Party, killed three men on Monday and injured dozens of others.
The violence erupted in the Durban township of Umlazi as about one thousand A-N-C supporters marched to protest labor law proposals.
Security forces were called in and used tear gas to disperse the marchers.
A labour protest Monday ended in violence in the strife-torn province of KwaZulu Natal.
At least three people were killed after the march was dispersed and A-N-C supporters began trading taunts with their rivals, the Inkatha Freedom Party.
Police struggled to quell the violence, becoming involved in scuffles with marchers.
The KwaZulu province has been a hotbed of conflict for almost a decade - as supporters of the African National Congress and the Inkatha Freedom Party have battled for political control.
Almost every politically-related action in the province results in conflict and often deaths.
Tension has been especially high since last Thursday, when President Nelson Mandela told parliament that he had instructed A-N-C guards to do whatever was necessary to protect their headquarters during a bloody Inkatha protest last year.
The guards killed nine Inkatha marchers that day.
Mandela's admission last week brought protests from Inkatha leaders.
Monday's march was one of many protests expected throughout the country in the next few weeks as trade unions continue to show their opposition to proposed labour laws.
But march organisers aren't expecting violence in the other protests.
In Monday's incident it would seem that the deep tensions between Inkatha and the A-N-C, rather than the issue of the proposed labour laws, were the cause of the violence.
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