"It will be a Mahabharath yudh between the Congress and an organisation that has all along claimed to be non-political but chose to take indirect control of its political face," the senior Congress leader told a public meeting organised by the party here late last night.
He alleged that the RSS "has been trying to sow seeds of evil and divide the people on communal lines."
Claiming that several Muslim youths were killed in encounters in Gujarat, Chidambaram said he did not approve of encounters when he was the Home Minister.
The Minister said Congress was responsible for various "revolutionary" laws and programmes including the Right to Information Act, Right to Education Act, employment guarantee scheme and Food Security Act.
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He assured that the Food Security Act would not affect the interests of Tamil Nadu which would get about Rs. 914 crore more as central subsidy for the public distribution system. There would be no reduction in the allotment of foodgrains to the state, he added.
AICC Secretary S Thirunavukkarasar said minorities would never support Modi as a moderate leader.
Congress would forge the right alliance at the time of elections and would return to power, he asserted.