a) As others have already told you and the article calls out, you can't hire someone for $0 under UK law, even if you offer commission.
b) The employees were all told they would get a salary and many were told they would get sponsored for a visa. Ali did not have the means to follow through with those promises.
b) The employees were all told they would get a salary and many were told they would get sponsored for a visa. Ali did not have the means to follow through with those promises.