More than 150 years ago, the British introduced a law in India designed to check rebellious natives. In 2010 this law has been used by an independent India to check activists who question government policy.

Section 124A of the Indian penal code was introduced in 1870 by the British to deal with sedition. It was later used to convict Mahatma Gandhi. In his statement during the hearing on 23 March 1922, Gandhi said, "The section under which Mr Banker [a colleague in non-violence] and I are charged is one under which mere promotion of disaffection is a crime. I have studied some of the cases tried under it, and I know that some of the most loved of India's patriots have been convicted under it. I consider it a privilege, therefore, to be charged under that section … I hold it to be a virtue to be disaffected toward a government which in its totality has done more harm to India than any previous system."

The man convicted under this section in 2010 is, like Gandhi, a man of peace. Dr Binayak Sen, celebrated human rights activist and medical doctor, has worked for more than three decades as a doctor in the tribal-dominated areas of the state of Chhattisgarh in central India, working for people denied many of the basic services that the state should provide, such as health and education.

As a civil rights activist, Sen has been an outspoken critic of the state government and its repressive actions against the armed rebellion launched by the banned Communist party of India (Maoist). The state has introduced special laws to suppress support for the Maoists, raising a militia to fight them. Independent observers concur with Sen on the extent of human rights violations, but in May 2007 he was arrested on charges of working with a banned organisation, based on visiting a well-known Maoist ideologue, Narayan Sanyal, in jail.

Denied bail for two years, Sen was finally allowed out on bail last year. On December 24, a case that on all counts was weak and based on hearsay and circumstantial evidence, concluded. Sen was found guilty of sedition and other charges, and sentenced to life imprisonment. The judgment has provoked widespread condemnation from Indian civil society.

Why this case has shocked people's sensibilities has as much to do with the man himself as the state in which he has chosen to work. Sen worked among the poorest and most deprived people in India, the Adivasis. The Maoists have also established their base in the tribal belt stretching through the heart of India. Their concerns are similar; their strategies diametrically opposite.

But for the Chhattisgarh government, the Maoists are evil and deserve no sympathy or understanding. Because they use violence, the response of the state must be equally violent.

Sen and many others who question India's development policy, which has exacerbated the gap between the poorest and the rich, argue that groups like the Maoists succeed because the state fails to serve the needs of the poor. In an atmosphere where everything is reduced to "You are either for us, or against us", there is no place for people like Sen who are fighting for social justice without violence. Arundhati Roy, who has dared to speak publicly about freedom for Kashmir and has spent time with the Maoists to present their worldview, also narrowly escaped sedition charges earlier this year.

The judgment against Sen also reveals the extent to which paranoia and political bias in a state can affect the justice system. In Chhattisgarh today you would need to be a brave individual to question the state. Even judges in lower courts will not. Sen's supporters are determined to file an appeal and take it to the highest court. But whatever the outcome, the very fact of such a ruling has shocked many. India's judiciary has not remained untouched by the scandals currently being unearthed of corruption in very high places. Yet, by and large, faith in the excruciatingly slow judicial system remains fairly high. Today people ask: if even high-profile people like Sen can be denied justice, what hope is there for some unknown citizen being picked and charged of being a Maoist sympathiser or a terrorist?