ANC
He took particular issue with the Public Investment Commissioners Telkom share purchase, involving former communications director-general Andile Ngcaba and the former head of the presidency Smuts Ngonyama.
COSATU accuses both men of taking advantage of their government posts to access privileged information.
In May 2010 the ANC threatened to charge Vavi with "ill-discipline".
Vavi has argued that under Jacob Zuma's government "We are heading rapidly in the direction of a full-blown predator state in which a powerful corrupt and demagogic elite of political hyenas increasingly controls the state as a vehicle of accumulation and warned of a possible Tunisia style revolution.
Read more about this topic: Zwelinzima Vavi