They're angry about the widely criticised Special Anti-Robbery Squad (SARS), which has been accused of harassment, torture and murders for years now.
One of the officers implicated in the assault of Clement Emekensha will be sentenced today.
The case was postponed to September so one of the accused could settle an issue with his lawyer.
The IPID is investigating another case of police brutality in the Western Cape.
MP Professor Ben Turok has promised to look into allegations made by Nigerians against the police.
Nigerians living in Cape Town have accused police of heavy handedness towards immigrants.
