"All those who have been loyal (to the family)...This kind of practice of bonded labour can happen there (Congress). Only in Congress can a person be bound to power and family," BJP national general secretary Anil Jain told reporters.
According to reports, all the newly-elected Congress MLAs in West Bengal have signed a written declaration on a stamp paper asserting that they would not leave the party.
The undertaking, made on a Rs 100-stamp paper, also seeks to ensure that the MLAs will not get involved in "anti-party activity".
In a meeting with the 44 new Congress MLAs at the party office yesterday, Chowdhury had made the proposal, to which all agreed.
"In the meeting it was decided that all MLAs will have to sign a memorandum (written on stamp paper) stating that they will not leave the party.