AICC in-charge for Delhi PC Chacko and three working presidents of the party Saturday wrote letters to Delhi Congress president Sheila Dikshit, objecting to the announcement of district and block-level observers.
In his letter to Dikshit, Chacko termed the appointments as "unauthorised".
Chacko said Dikshit's decision to dissolve the 280 block committees was already "stayed" by him so appointment of block observers was not only "unauthorised" but would create "differences and conflict".
Dikshit on Friday had announced names of district and block-level observers to strengthen the party organisation in view of the Assembly elections due early next year.
Senior leaders including former ministers were appointed as district observers to supervise appointments to the post of presidents of 280 block committees of the party in the national capital.
Chacko raised objection over the appointment of district observers, claiming the decision was taken "without consulting" three working presidents and him as in-charge of Delhi Congress.
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"I am sorry to say that a senior leader of your stature should not have flouted the AICC directive and taken this decision leading to differences and conflict in the rank and file of the party," Chacko wrote to Dikshit.
The former Thrissur MP asked Dikshit to keep in "abeyance" all recent actions and call a meeting of the party's office bearers in his presence for discussing organisational matter.
In the letter, Chacko added that the former Delhi chief minister should "restrict" persons "acting on her behalf" and hurting the party's image by passing on information to media.
Dikshit's close aides said she was admitted to the hospital and could not speak on the matter. They said Dikshit was expected to be discharged soon.
In another letter addressed to Dikshit, working presidents Rajesh Lilothia, Haroon Yusuf and Defender Yadav expressed resentment over not being consulted in the decision making.
"It is saddening that all the decisions taken in the past were unilateral without even informing us," the working presidents said, in their jointly signed letter, pointing to the formation of a committee to probe the party's debacle in Lok Sabha polls, dissolution of block committees and appointment of observers.
However, Lilothia, who attended the meeting of district and block observers held at Delhi Congress office on Friday, said, "These are suggestions through which we routinely update the leadership as a part of our party's internal democracy."