About 100 people protested outside the hall where ANC Youth League deputy president Ronald Lamola was delivering a lecture on economic freedom on Tuesday.
Lamola's lecture at the Durban University of Technology started an hour late after journalists initially outnumbered supporters.
As Lamola was being introduced, loud singing could be heard outside the hall.
The opposing faction wore T-shirts and displayed posters that read “ANCYL 100% Support for Zuma”. University security prevented them from entering Mansfield Hall. - Sapa