JOHANNESBURG - Civil society groups will gather outside the Esidimeni arbitration hearing on Monday.
Former Gauteng Health MEC Qedani Mahlangu is expected to start her testimony after much delay.
The Treatment Action Campaign (TAC) and the South African Federation of Trade Unions (Saftu) -- among others -- will demonstrate.
They say they are acting in solidarity with the victims' families.
A total of 143 psychiatric patients died after being moved from Life Esidimeni facilities to unlicensed NGOs.
The TAC and Saftu say corruption, poor management and ignorance around mental health issues must be addressed.
Demonstrators are expected to arrive at the venue during the tea break, saying they don't want to disrupt proceedings.