"Organisations and people of a particular ideology are spreading it to divide people. We are under no illusion that it is an accident.
"The hate, violence and petty mindedness is being unleashed as part of a pre-determined plan. We will not allow such a diabolical design to succeed...It will shake country's foundations....We are ready to fight the battle," Gandhi said.
"Today, our legacy is under threat...We are known the world over by our unity in diversity," the Congress president said at a ceremony where she presented the 29th Indira Gandhi Award for National Integration to Gandhian social activist Rajagopal P V.
Noting that Indira Gandhi deeply understood the value of unity in diversity, she said had the late Prime Minister been alive she would have wanted the party to stand with the common man and fight for his cause.
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Gandhi also underlined the importance of the public sector, insisting that the late Prime Minister understood that the cause of people and national integration would be better served through it.
Former Prime Minister Manmohan Singh hailed Rajagopal's efforts to persuade dacoits in the Chambal valley to give up arms in the 1970s. His efforts had led to surrender by more than 500 dacoits.
While accepting the felicitation, Rajagopal said he would utilise the award money of Rs 10 lakh to educate volunteers to promote the cause of national integration and removal of poverty, issues dear to the heart of Indira Gandhi.