Notorious Supermax prisoner Bassam Hamzy has been allowed to call on convicted terrorism plotters to give evidence in a case disputing his jail conditions.

Justice Geoffrey Bellew on Monday granted leave for Hamzy to subpoena nine inmates from Goulburn jail's high-risk management unit, including Mohammed Omar Jamal​ and Omar Baladjam​, members of one of the most comprehensive terrorism cells in Australia, who are serving time for planning an attack.

Bassam Hamzy is at Goulburn Supermax prison.

He is also allowed to subpoena terrorism suspects Raban Alou​, Omarjan Azari​, Sameh Bayda​ to adduce evidence about their specific conditions in jail.

Hamzy, the founder of the notorious Brothers for Life gang, is representing himself in a legal action against the Corrective Services Commissioner and the jail's management, claiming he was denied access to lawyers and to a laptop.