The prosecution case was that serial offender 'Gym' Hakkim and two of his accomplices had kidnapped a girl student who was in a car along with her friend in the city, taken them to an abandoned building near Sulur on the outskirts, with three others following them in a car.
They allegedly took photographs of the friends in a compromising position and wanted to extort Rs five lakh cash from them to hush up the matter.
Delivering the judgement, Judge M P Subramaniam sentenced Hakim to life imprisonment, one-year term plus Rs 5,000 for rioting, 20 years and Rs 20,000 for kidnapping.
The sentences will run concurrently.
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He was also asked to pay Rs one lakh as compensation to the victim, which could be used for legal aid if the victim rejected the amount.
The other accused - K George Kingsley, Mohammed Aniz, S Karthik and S Miga Prkash were found guilty of rioting, kidnapping, wrongful confinement, dacoity and criminal conspiracy and were sentenced to 20 years imprisonment.