In February 1971, Major Jalil came to Barisal on leave from his place of posting in Multan, and joined the war of liberation in March.

[2] Mohammad Abdul Jalil had pioneering role in floating the new political party Jatiyo Samajtantrik Dal (JSD) in October 1972.

[citation needed] The JSD under his leadership endeavored to establish '"scientific socialism" in the country and was altogether active in anti-government politics.

Major Jalil was arrested while launching a program of the party activists to besiege the official residence of the then Home Minister on 17 March 1974.

[citation needed] Major Jalil contested in the presidential election in 1981 as a nominee of the three-party alliance of JSD, Workers Party and Krishak-Sramik Samajbadi Dal.