Hazara Singh, a Ghadar Party revolutionary, was born in Amritsar's Dadehar village. His father’s name was Bela Singh. In search of better opportunities, like so many other Punjabis, he left his home in the early twentieth century. He moved to Shanghai, and from there he went to America. He was a close associate of Wisakha Singh – an important leader of the Ghadar Party. He worked in his California farmhouse. It was a large farmhouse with over 500 acres. Many Punjabis were employed there, and it became an important meeting place for the Ghadar Party members. A Gurdwara was established in Stockten by community members, and Hazara Singh was appointed as its first granthi (priest).
With the outbreak of World War I, the Ghadar Party called on its cadre to travel to India and fight for India's independence. Hazara Singh arrived in India and met up with Wisakha Singh and others in Punjab. Ghadarites chose 21 February 1915 was the date for their uprising. However, British officials came to know of it. The plan was postponed to February 19, but this was also made known to the administration. The planned uprising of the Ghadar Party was thwarted, and many revolutionaries were arrested. In the first Lahore Conspiracy Case, Hazara Singh was also arrested and tried. The court issued its decision on September 13, 1915. Sections 121, 122, and 121 A was applied to Hazara Singh. He was sentenced to life in the Andaman and Nicobar Islands Cellular Jail, with property forfeiture.