"When the Left Parties were allies of the DMK and even when they were not, Bardhan has been a good friend of mine. He was a person who always had respect for the party. I have lost a good friend of mine," Karunanidhi said in his condolence message.
"I extend my deepest condolences to his family and the several Communist party cadres," he said.
MDMK Chief Vaiko said he could not forget the remarkable speech made by the late CPI Leader when MDMK was staging a protest in New Delhi urging the Centre to stop the 'Eelam Tamil war' in Sri Lanka.
"I cannot forget the brief interaction I had with him on the formation of People's Welfare Front during my recent visit to New Delhi," he said in his condolence message.
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Tamil Nadu Governor K Rosaiah, state units of CPI (M) and CPI also expressed grief over veteran leader's death.
"I am deeply shocked and grieved to hear about the demise of A B Bardhan. He made immense contribution to the working class, trade unions and to uplift the downtrodden," Rosaiah said in his condolence message.
CPI (M) state secretary G Ramakrishnan said Bardhan strengthened ties and brought unity among the two Left parties. "His demise is not only loss to Communist party but also for Left parties as a whole," he said.
CPI's state unit general secretary R Mutharasan in his condolence message said party flags would fly half-mast for seven days while various party programmes have been cancelled as a mark of respect to the late leader.