In an open letter, they said the disquiet had prompted them "to chronicle their reservations and misgivings" about the developments.
They expressed concern over the "ugly trend of trolling, threats and online intimidation of activists, journalists, writers and intellectuals who disagree with the dominant ideology".
The letter referred to "rising authoritarianism and majoritarianism", which, they said, barred debate and dissent.
They appealed to public authorities and Constitutional bodies to take heed of these disturbing trends and to take corrective action.
"We have to reclaim and defend the spirit of the Constitution of India, as envisaged by the founding fathers," they said.
The letter mentioned a communal campaign in the run-up to the Uttar Pradesh elections, held earlier this year.
The question was also asked if electricity was being supplied equally to different communities during their religious festivals, it said.
"It appears as if there is a growing climate of religious intolerance that is aimed primarily at Muslims," it said.
The banning of slaughter houses targets minorities and affects their livelihoods as well. Such intolerance breeds violence in a communally charged atmosphere, the letter said.
"Vigilantism has become widespread. An Akhlaq is killed on the basis of a suspicion that the meat he has is beef and a Pehlu Khan is lynched while transporting to his place two cows he had bought and for which he had the necessary papers," said the former bureaucrats, who had held important posts at both the Centre and in the states.
"The behaviour of vigilantes - who act as if they are prosecutor, judge and executioner rolled into one - flies in the face of law and jurisprudence," the letter said.
It mentioned "anti-Romeo" squads that threatened young couples and attacks by administrations -- "with a supportive government to back them" --on student groups and faculty members on campuses such as Hyderabad and JNU.
Several NGOs and civil society organisations, it said, were being charged with violating provisions of the Foreign Contribution regulation Act and the Income Tax Act.
The letter was signed by former officers such as 91- year-old Har Mander Singh, who belonged to the 1953 batch of the Indian Administrative Service, former Culture Secretary and Prasar Bharti CEO Jawhar Sircar, former Secretary of Department of Economic Affairs E A S Sarma and former Mumbai police chief Julio Rebeiro.
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