The National Union of Metalworkers of South Africa, or NUMSA, the biggest affiliate of the umbrella union movement COSATU which is one of the partners in the ruling ANC tripartite alliance, said President Jacob Zuma's administration has been marked by one scandal after another.
The decisions were made at a special congress of the union, held east of Johannesburg.
"It has just passed anti-working class law and policies," said Jim.
He said the union would not support the ANC in next year's elections. "NUMSA as an organisation will neither endorse nor support the ANC or any other political party in 2014," he said.
Also Read
The union's alliance with the ANC is dysfunctional, in crisis, paralysed and dominated by infighting and factionalism, said Jim.
With more than 320,000 claimed members, NUMSA makes up a considerable chunk of Cosatu's 1.8 million membership. It's not certain however how many votes the ANC stands to lose as a result of the union's withdrawal of support as members are still free to decide who they want to vote for. But there has been growing disenchantment with the ANC's leadership and observers believe it is sure to have some impact at polling booths next year.