Madan Singh was from the Lahore district's Gaga village. His father’s name was Mal Singh, In Lahore Cantonment, he was a Sikh preacher (Granthi) and ran a carpentry shop. He used to act as a go-between for the revolutionaries and the troops in the cantonment. He was known as Bhai Lallo of the ghadarites (a disciple of Guru Nanak Dev).
On September 13, 1915, the Lahore Tribunal sentenced him to transportation with forfeiture of property under Sections 121 and 121 - A of the Indian Penal Code in the first Lahore Conspiracy Case of 1915. He was found bringing Akali newspapers into Sabarmati Jail and was consequently transferred to the Central Jail Karachi. He, too, maintained contact with Akalis in Amritsar, sending articles for publication in the Kirti and the Asli Quami Dard. In 1928, the British government considered his case for release, but the local authorities refused to release him.