All five men were sentenced under the Unlawful Activities (Prevention) Act. The Gadchiroli court, which was hearing the case, found them guilty of knowingly facilitating the commission of a terrorist act, being a member of a terrorist organisation, and supporting the activities of a terrorist organisation.
His lawyers say they will appeal against this decision at the Nagpur Bench of the Bombay High Court.
Calling the judgment shocking, Vasanta, the wife of Professor Saibaba, said, "It seems the state and Central governments have put a lot of pressure on the judiciary to implement anti-people and undemocratic policies at the behest of corporates and MNCs."
The government, she said in a statement, has been putting "relentless pressure on my family for the last four years" by raiding their house in Delhi. "As a wife I will fight in the higher courts to seek justice," she added.
Professor Saibaba had approached the Supreme Court after the Nagpur bench of the Bombay High Court cancelled his bail, and he was sent back to the Nagpur Central jail on December 2015.
The 49-year-old professor suffers from a serious heart condition and needs help for every task including bathing, eating, washing and even going to the toilet. In the jail, he was dragged by hands by guards, which ruptured his nerves from neck to left shoulder and made his left hand immobile. He also had a history of falling unconscious during the 14-month period he was in prison.
A teacher at the Ram Lal Anand College, Professor Saibaba had been asked not to enter its premises without permission as it creates "law and order problems". He had also been attacked thrice on the college premises. His Rs 62,000 salary was halved by his college after instructions from the University authorities, who pushed his family out of the campus after his arrest.
His friends and rights activists have argued that Saibaba needs to be treated with honour as he was a disabled professor and not a threat to the society. An online campaign had been launched demanding justice for him.