In 1975, aged 24, Singh was appointed District President of the Jana Sangh. In 1977, he was elected Member of Legislative Assembly from the Mirzapur. At that time he was influence by the JP Movement of Jayaprakash Narayan and joined the Janata Party and was elected as Member of Legislative Assembly from Mirzapur. He was also arrested in the year 1975 during the state of National Emergency for associating with JP Movement and was detained for a time period of 2 years and when he was released, he was re-elected as Member Of Legislative Assembly.