Pretoria - The National Union of Metalworkers of SA (Numsa) president Andrew Chirwa said Cosatu's top brass are pre-occupied with sex scandals to the extent that they violated the union federation's constitution.
Cosatu and Numsa have been at loggerheads following the suspension of Cosatu general secretary Zwelinzima Vavi.
Numsa wants Vavi's suspension to be lifted and has led eight other unions in calling for a special Cosatu national conference.
"A group within Cosatu is running away from its constituency. They refuse a special national conference. I wonder where do they get a mandate?" Chirwa said.
He said Numsa was a critical component of Cosatu, and a founding member, and that Cosatu's central committee had turned into a sex tribunal.
"They spend a year discussing sex scandals... they are pre-occupied with sex scandals to the extent that they violated the Cosatu constitution."
At the opening of Numsa's national bargaining conference in Pretoria on Monday Chirwa accused the ANC of failing to improve the lives on the working class, claiming that they simply replaced white capital with black capital.