The chairman of the committee, Ram Krishna Dwivedi, issued the notice to Singh for "anti-party" activities and asked him to reply within five days, media in-charge of the party Satyadev Tripathi told reporters here.
In the notice, Dwivedi stated that at a time when it was essential for all the partymen to remain united, Singh had created "chasm" within the organisation and given rise to "infighting".
"Your undignified behaviour against the party line is a very serious issue and has made a negative impact," the notice stated.
The action against the MLC was taken as he had allegedly misbehaved with the local leaders of Rae Bareli and passed objectionable comments against senior party leaders.
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