Members of SA Democratic Teachers Union's Gauteng region blocked the Meadowlands Magistrate's Court entrance on Monday ahead of their chairman Moss Senye's appearance for allegedly assaulting a pupil.
Doors to the court have also been shut to control the crowd entering the building.
Senye, a Meadowlands school principal, and teacher Ofentse Phehle, are accused of assaulting a 17-year-old-pupil.
Senye was suspended in February pending the outcome of the case.
Scores of SADTU members braved the wet weather and sang struggle songs that contained offensive lyrics, in support of their leader.
At the last appearance, more than 100 teachers protested outside the court demanding he be reinstated.
The education ministry suspended Senye in February pending the outcome of the court case.
The case was postponed to May 11.
Controversy
At a mass rally on Thursday, the union proposed security allowances for its members saying teachers, like police officers, deserved a danger allowance.
It said the safety of teachers was a concern because some children came to school with weapons.
On Friday, Senye was caught up in a row over comments suggesting that Gauteng education MEC Barbara Creecy hated black people, but remained optimistic ahead of his appearance.
Creecy has warned there would be consequences for teachers staying away from school to attend the court appearance.
Senye called on Creecy to step down, labelled her a "Satanist" and urged members not to align themselves with white people as they would be tainted with Satanist.
His comments were condemned by the ANC in Gauteng who labelled them "irresponsible" and "reckless".
The secretary of his union body also distanced the union from his comments.
"If such a statement was made, it is indeed, highly regrettable," Mugwena Maluleke said.
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