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.
Sadtu president Thobile Ntola has criticised his expulsion along with the union's provincial body and Numsa.
Basic Education Minister Angie Motshekga will launch a probe into allegations of job promotion racketeering by Sadtu members.
The Congress of South African Students says Sadtu must put learners first ahead of its "narrow and selfish interests".
Government must show Sadtu the door, otherwise just hand the entire ministry of education over to this power-crazed union, writes David Macfarlane.
Basic education director general Bobby Soobrayan has been found not guilty of wrongdoing, says department spokesperson Panyaza Lesufi.
In a declaration after its national general council, Sadtu has urged its members to support Cosatu's suspension of general secretary Zwelinzima Vavi.
The issue of payments to matric markers, which has been at the centre of a Labour Court dispute has raised the same questions as the textbook debacle.
The basic education department's advocate says Bobby Soobrayan was not authorised to sign the agreement, which makes it null and void.
The South African Democratic Teachers' Union has denied supporting Cosatu general secretary Zwelinzima Vavi's apology for an extra-marital affair.
Unions and opposition parties have questioned why Angie Motshekga survived President Jacob Zuma's Cabinet reshuffle despite her poor record.
Sadtu has suspended its strike after the basic education minister agreed to some of its demands, including an investigation into her director general.
In this week's Weekend 101: Sadtu calls for Angie Motshekga to resign, Boston bombing mom speaks out and South Africa tweeted â€¦ from space.
Sadtu has threatened a full-blown strike if Zuma does not respond within 21 days to their demand to fire Angie Motshekga and Bobby Soobrayan.
Classrooms stood empty as Sadtu members took to the streets calling for Angie Motshekga and Bobby Soobrayan to step down immediately.
Cosatu has warned Basic Education Minister Angie Motshekga not to take action against protesting teachers at the Sadtu march.
Sadtu expects about 25 000 of its members to take part in Wednesday's march to pressure basic education's minister and director general to resign.
Teachers joining a planned Sadtu protest march will face disciplinary procedures, says the basic education department.