"There was no need for RSP to cross over to the UDF camp in such haste,' he said at the party's district unit meeting here.
The RSP, which had two MLAs in the previous assembly, after one member, Kovoor Kunjumon quit shortly before the May 16 assembly polls, had failed to win even a single seat out of the five it contested in the polls.
Chandrachoodan said he was saddened that the leadership had failed to prevent the shift.
"There was no need to shift to the UDF camp so hastily. In this front, how long we will be able to continue, needs to be seen", he said.
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However, Chandrachoodan made it clear that RSP would not leave the UDF soon.
Praising LDF's one month-old-rule, he said it was going in the right direction.
Party state secretary A A Azeez however defended the decision to join the UDF, saying it was jointly taken by the leadership.
It joined UDF and successfully contested from the Kollam seat, in which N K Premachanran emerged victorious.