Correctional Services spokesman Manelisi Wolela has denied allegations that student leader Mcebo Dla.
The ANC has offered the services of its secretary general to the parties involved in negotiations to end the public service strike.
The party's spokesman Smuts Ngonyama said yesterday: "We have mandated the secretary general Kgalema Motlanthe to make himself available to the parties involved to help them find consensus."
Ngonyama made the announcement during a media briefing on the ANC policy conference which starts today.
Ngonyama dismissed the call from Cosatu in the Western Cape that the conference should take a stand on the strike.
He said it was not ANC policy to interfere in matters relating to the bargaining process.
Ngonyama said the ANC respected the workers' right to strike but also respected the rights of those workers who were not part of the strike. He called on the police to protect non-striking workers against violence "especially from the strikers".
He condemned the bad language used against government officials, especially President Thabo Mbeki and Public Service and Administration Minister Geraldine Fraser-Moleketi.
"Using insults against our leaders is unacceptable," Ngonyama said.
He said the ANC was concerned about the strike's effect on health services and schools.