About 2000 party members, led by their leader, Julius Malema, had marched to the legislature to protest against the removal of their MPLs during a sitting on July 1.
The party’s members of the provincial legislature were ejected from the house for wearing red overalls.
On arrival at the legislature, they pushed through a human chain of police officers in front of the building and stormed inside.
Malema and some members went inside while others banged on the closed doors.
They continued to sing outside the building while police stood guard at the door.