Upon his return to India, he joined forces with the oppressed Hindu peasants of Telangana and took part in anti-colonial uprisings to the chagrin of his bourgeoisie family.
[3] In the aftermath of the Partition of India and the Liberation of Hyderabad from the rule of the Nizam by Indian forces, the communist movement in Telangana collapsed and a temporary military administration was instituted in the region which subdued the collectivized communes established by the peasant rebels.
Nasir's reconnection with Indian communists further radicalized his ideology and hardened him as a person, and he began serving as the office secretary of the National Awami Party (NAP) after his arrival back to Karachi.
There was such a fervor over his martyrdom that the President Ayub Khan government had to exhume his body to attempt to prove to the prosecution point that he had committed suicide and was not tortured.
On 13 November, at 12:40 pm, the Assistant Deputy Inspector General of the Criminal Investigation Department received a call from the line officer at the Lahore Fort that Hassan Nasir was found hanging in cell number 13 at 11:00 am that morning.