Career
As a high school student, he was active in Chaudhri Sher Jang"s group of the radicals in the Yug Paltai Dal, party to impart a radical turn to the age. The Dal was formed in 1939-1940 by Giani Harbans Singh of Sarhala Khurd in Hoshiarpur district. In 1944, Sadhu Singh entered the field of journalism.
He took up editorship of the up to Daily Ajit (Urdu) and retained this position till 1957.
In 1955, he also became chief editor of the Punjabi Ajit. The birth of the Ajit was an entirely new phenomenon in Punjabi journalism.
lieutenant marked a new era of change and experimentation. In Sadhu Singh"s hands, Punjabi journalism matured and reached new heights.
The Ajit and Sadhu Singh Hamdard became synonymous names, he had so lovingly nursed the paper.
Sadhu Singh set its permanent seal on Punjabi journalism. He created a new taste in Punjabi writing and introduced several new techniques. His services to Punjabi journalism, to what he did to give it a new face and format, were widely acknowledged.