[6][7] He has also served on the key position of the ruling party JDU, which includes the General Secretary of Bihar wing of Janata Dal (United).

[8] Within the party, the Janata Dal (United), Singh was also appointed as the state president of Farmers and Cooperative cell.

The appointment took place after Umesh Singh Kushwaha assumed the charge as State President of Janata Dal United.

[13] In 2023, Singh was arrested on the charges of being involved in 'Bibhutipur double murder case', that occurred in Samastipur's Singhia Bujurg Panchayat area.

Rambalak Singh was the prime accused in this case, as shortly before the murder of the two men, a private video of him was made viral, in which he was spotted with a woman in a hotel room.