What was the role of K. Kamraj in the process of selecting Nehru's successor?

He consulted with party leaders and members of Parliament to whom to make the next Prime Minister of India.

The succession following Nehru's passing defied critics' expectations with its smooth execution. After Nehru's demise, K. Kamraj, the president of the Congress party, engaged in consultations with party leaders and members of Parliament. These discussions yielded a consensus in favor of Lal Bahadur Shastri. In a unanimous decision, Shastri was chosen as the leader of the Congress parliamentary party, consequently ascending to the role of the country's next Prime Minister.

Lal Bahadur Shastri, hailing from Uttar Pradesh, emerged as a non-controversial leader who had served as a Minister in Nehru's cabinet for an extended period. Nehru had grown reliant on him, particularly in his final year. Shastri's reputation was grounded in his simplicity and unwavering commitment to principles. Prior to this, he had tendered his resignation as the Railway Minister, accepting moral responsibility for a significant railway accident.

Shastri led the country as Prime Minister from 1964 to 1966.