The metalworkers' union had tired of the ANC and wanted Cosatu to break with the ruling party and come with them into a brave new socialist future.
The ANC general secretary has dismissed claims that the party is trying to reduce Cosatu to a labour desk, and has called on unions to do their work.
Numsa is playing all its cards and forging ahead, at all costs, with its plans to stand firm in its political ideals.
Calling Numsa's imminent expulsion from Cosatu a well-co-ordinated plan by the ANC, the union has formed its own party and promises to go to court.
A political analyst says despite its strength in numbers, Numsa is wise to tread carefully with trade federation Cosatu.
Unfazed that it may be booted out, Numsa has vowed to push ahead and form a workers' party.
Differences of opinion and divisions in Cosatu cannot be resolved through elections or by axing members, an ANC-led task team has found.
ANC leaders appear set on advising Cosatu to boot the union from the federation, but Numsa is determined to fight any suspension.
Protesters campaigning against e-tolling, led by Cosatu, embarked on a drive-slow that garnered both support and irritation from the public.
Angry unionised workers say they have been sidelined and betrayed by their leaders.
Jacqueline Phooko, the office worker with whom Zwelinzima Vavi had "brief intercourse", is suing Vavi, Cosatu and Numsa for damaging her reputation.
President Jacob Zuma has appealed to leaders within the alliance to put their differences aside to ensure it continues to be a leader in society.
The teachers union snubbing Zwelinzima Vavi in favour of S'dumo Dlamini as a speaker at its congress suggests the ANC has failed to reunite Cosatu.
Unless its leaders act urgently, the federation will face a decline in membership, political clout and reputation, says Zwelinzima Vavi.
An ANC task team has pulled out all the stops in its attempts to heal the troubled trade union federation, but to no avail.
Why is Zwelinzima Vavi spending his precious political capital on a boycott of Generations in support of highly-paid actors, asks Verashni Pillay.
The trade union and the Creative Workers Union of SA agreed to campaign for the actors demands and ask viewers to "switch-off" from September 15.
Speaking to the advisory panel on the socio-economic impact of e-tolls, Cosatu's Dumisani Dakile says e-tolls "will perpetuate exclusion in society".