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The seven face charges of human trafficking, kidnapping and violation of labour laws.
A witness told the court of the "painful" working conditions he experienced at the Johannesburg factory.
A witness, who testified against the seven Chinese nationals accused of human trafficking, was told by the defence that he had committed a crime by entering South Africa without a passport.
"As you are standing here today, you are an illegal immigrant. Do you agree?" advocate Jannie Kruger, for the accused, told State witness Matola Ndika during cross-examination on Thursday.
Responding, Ndika said: "That is true, I don't have a passport."