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ANC secretary-general, Gwede Mantashe hit out at ill-disciplined ANC members, the party's youth league and Cosatu.
Delivering the party's organisation report at its 53rd elective conference in Mangaung on Sunday, he warned of "splinters" breaking away from the ANC that could "reduce the weight of the movement".
He said Cosatu was one of the "culprits" that have been calling for change in the party.
He said when Cosatu spoke out against the ANC and said the current government was the same as the apartheid one, it had an impact.
Mantashe criticised Cosatu for focusing too much on the ANC.
"We made an observation that half of the time it gets too pre-occupied with analysing the ANC and not on its own internal
analysis."
On the ANC Youth League, Mantashe said it was acting in a similar manner to forces who were against the party.
"The ANCYL is a body of opinion within the ANC. Therefore it must complement and supplement the ideas of the movement.
"In the public eye it makes the ANC... look like its tailing behind the ANCYL," Mantashe said.
"There is a general decline in organisational discipline," Mantashe told delegates.
"An overwhelming number of [disciplinary] cases involved public representatives at municipalities. We need to raise political
awareness at the local government level."
He criticised those who leaked information to the media, and said those who disagreed should rather talk to each other.
Mantashe said wehen electing a new leader, delegates should vote with the party's best interests at heart and not expect anything in return.
"Focus... must be on deeper democracy and appreciate that the elective conferences are part of the democratic tradition of the
ANC. "The focus should never be on personality, it should be on sharpening that tool," said Mantashe.
