The understanding, he said, was forged in a "desperate attempt" to capture the local bodies where TMC does not have majority.
"There are reports, there are allegations and charges. There is a tremendous amount of pressure, threat, terror, corruption and intimidation. It is a lethal combination. So through these methods they are trying to lure several comrades.
"Communists are made of better steel than others, but there still may be some people - I am not ruling it out. But we need to resist this atmosphere of terror, threat and intimidation," the CPI-M general secretary told media.
"They are targeting those areas, panchayats and zilla parishads where people did not vote for them. This is happening nowhere in the country. It is unprecedented even in West Bengal," he said.
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Yechury, who was addressing the media at the end of the two-day extended CPI(M) state committee meeting to discuss ways to strengthen the party organisation and remove its weaknesses, said the party was taking steps to revamp the organisation.
"To organise mass resistance against undemocratic methods of TMC, we need to have a better organisation. Such methods prove that TMC has not been successful in wiping out opposition parties from the state. We will bounce back in days to come. We have faced such situations earlier too but we had bounced back," Yechury said.
In a bid to expedite decisions to be taken by the party, CPI(M) Bengal unit yesterday discussed removing the zonal committees from the three-tier decision-making process.
The party, which is slated to hold a state-level plenum, said it will also look into the lacunae in recruitment, training and giving tickets to party workers.