Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
The ANC has dismissed claims by right-wing organisations linking the killing of Eugène Terre'Blanche to its youth league president Julius Malema's singing of a traditional ANC struggle song, containing the words "shoot the Boer".
ANC spokesperson Jackson Mthembu said : "It is our belief that the continued linkage of the singing of the song by Comrade Malema to the killing of Mr Terre'Blanche is not only mischievous but also inciteful and meant to fuel racial polarisation in our country during a highly emotion-charged and sensitive moment.
"The ANC is concerned and worried about the continued utterances by some political parties, particularly the AWB, Freedom Front Plus and AfriForum, who have linked the death to the singing by Malema of the struggle song Ayesaba amagwala (cowards are running) some recent public gatherings," Mthembu said.
He said claims that blacks intended to harm other race groups, in particular whites, were "baseless and devoid of all truth".
The Communications Workers Union (CWU) also shot down the claims linking Terre'Blance's death to the singing of the struggle song.
CWU spokesperson Matankana Mothapo said: "We want to publicly dispel the lies by Democratic Alliance and other like-minded right-wing organisations that are opportunistically linking the death of Terre'Blanche to the struggle song Dubula iBhunu as malicious and an incitement of racial violence. Struggle songs played a role in defeating the apartheid system and the racist agenda as personified by Terre'Blanche."
Political leaders and civil society organisations have called for calm following Terre'Blanche's death.
In a TV address on Sunday President Jacob Zuma appealed to political leaders to think before making statements that could inflame racial tensions, including Malema.
"I would like to call for calm ... and allow for the police and other law enforcement agencies to investigate what it is that caused this," Zuma said.
The SACP said Terre'Blanche was against transformation and national reconciliation but did not deserve to be killed.