The Congress, however, maintained that it was a "voluntary" exercise by the legislators.
Trinamool Congress(TMC) poked fun at the Congress, saying it was attempting to check cross over of its MLAs to the ruling party by asking them sign court papers, saying this showed that the party does not have faith in their own elected legislators.
The need for a signed pledge that they would not leave the party was proposed by Adhir Chowdhury, the chief of the West Bengal unit of the Congress, at a meeting with the new legislators yesterday ostensibly to keep its flock together and all those present were reported to have agreed.
BJP national general secretary Anil Jain took a dig at Congress over the "signing" of a declaration on a stamp paper by the MLAs pledging that they would not leave the party, saying such practice of "bonded labour" can only happen in that party.
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Congress chief spokesman Randeep Surjewala said no instructions for proving the loyalty have been issued by the AICC or the General Secretary In-charge.
"This is a voluntary exercise and nothing more should be read into it", he told reporters in Delhi.
In reply to a volley of questions, he, however, said that during the last Assembly, 10 Congress legislators in the state were "poached" in violation of the Anti-Defection law.