"When famous economist Amrtya Sen praised Bihar model of development, divisive forces hailing from a party led a campaign on social media to assassinate his character," he said at a book release function here.
"Their intolerance towards things they do not like reminds of days of Emergency in 1975 when freedom of speech was throttled," Kumar said.
Noting that this was "misuse" of social media to create a "certain type of environment", he asked in which era 'they' want to take the country?
After release of the book on development of Bihar edited by diplomat-turned JD(U) MP N K Singh, Amrtya Sen had praised Bihar model and he told a TV channel that he did not want Modi to become Prime Minister as he did not have secular credentials.
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Infuriated by this, BJP MP Chandan Mitra had said the Bharat Ratna award, conferred on him by the NDA government, should be taken back from Sen. Mitra, however, regretted his remark later.
The book release function was followed by a panel discussion on Bihar development.
While the panelists analysed the turnout of Bihar from a BIMARU state into a developed one now, the Chief Minister sat among audience.