He said the split between the Congress and the CPI(M) is the reason behind the growth of the BJP in West Bengal.
"The CPI(M) and the Congress together at the national level could have put up a strong alternative to the BJP and its policies at the Centre," Chowdhury said.
Yesterday, CPI(M) general secretary Sitaram Yechury's draft resolution proposing an alliance with the Congress was voted against by the party's central committee.
Chowdhury said the division of votes between the Congress and CPI(M) is helping the BJP and the ruling Trinamool Congress in West Bengal.
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"Since the day the CPI(M) broke the alliance with the Congress, the BJP's vote share has been increasing. The rise of the BJP in the state is due to the CPI(M)'s inability to hold on to its votes," he said.
Chowdhury said the TMC wants a four-cornered fight in the state for its own benefit.
Though the political line worked out by the CPI(M) party congress in 2015 had precluded any understanding or electoral alliance with the Congress in the fight against the BJP, the party had allowed state units to review specific political situation before deciding their own tactical line in consonance with the overall understanding.
As a result, the CPI(M)'s West Bengal unit had entered into a tactical alliance with the Congress for the 2016 polls, which proved disastrous as the Left was relegated to the third position in the state.
The two parties fought separately in the recent bypoll for Sabang Assembly seat and have fielded their respective candidates for Uluberia Lok Sabha bypoll in West Bengal slated for January 29.