"Will always remember Shri A B Bardhan as a passionate Communist, fully committed to his ideology & principles. May his soul rest in peace(sic)," Modi tweeted.
Gandhi said, "In his demise, not only the CPI but the entire nation has lost a leader who championed the cause of the dispossessed and marginalized throughout his life."
BJP leader Mukhtar Abbas Naqvi said his death was a huge loss to Indian politics while CPI(M) general secretary Sitaram Yechury said his wisdom, experience and guidance will be missed.
Bihar Chief Minister Nitish Kumar said an era has ended with the demise of Bardhan, who had always worked for the poor and downtrodden.
The CPI stalwart was the "epitome of political decency and selfless service", Tamil Nadu Chief Minister J Jayalalithaa said.
