New Delhi, Sep 13 - He uses a stick to walk, looks frail and is 91 years old. But Delhi-based Gandhian Shambu Dutta's resolve is firm - to fast unto death unless the government takes concrete steps to weed out corruption in India.

'The cause of ensuring probity in India's political leadership now requires citizens' sacrifice and I, an unknown entity, shall do my duty,' Dutta, who is planning to begin his fast Jan 30, told IANS.

'I believe that my death will persuade the government in taking effective and concrete measures against corruption in India.'

Jan 30 is observed as Martyr's Day in India to mark the day in the year 1948 when Mahatma Gandhi was shot dead. 'Corruption will be out one day, however much one may try to conceal it, and the public can, as its right and duty, in every case of justifiable suspicion, call its servants to strict account, dismiss them, sue them in a law court or appoint an arbitrator or inspector to scrutinize their conduct, as it likes,' Gandhi used to say.

'Of the various forms of corruption rampant in our country, political corruption is the greatest betrayal of the nation,' said Dutta, clad in a khadi kameez-salwar. 'The nation is more vulnerable to corruption than terrorism,' he warned.

The man who who took part in the 1942 Quit India Movement and went to jail as a freedom fighter functions from a modest two-room office in south Delhi.

Dutta leads 18 Gandhians from across the country with a group called Gandhian Satyagraha Brigade, a non-party organisation that also raises its voice against socio-political vices.